of a hydrogenatom showing the diameter as about twice the Bohr model radius. Image not to scale A hydrogenatom is an atom of the chemical element hydrogen . The Electric charge electrically neutral ... be used for each hydrogen isotope. The hydrogenatom has special significance in quantum mechanics and quantum ... frequencies of the hydrogenatom after making a number of simplifying assumptions. These assumptions ... for the hydrogenatom uses the fact that the Coulomb s law Coulomb potential produced by the nucleus ... n 1, 2, 3, ... . The principal quantum number in hydrogen is related to atom s total energy. Note ... symmetry . In addition, for the hydrogenatom, states of the same n but different are also ..., any eigenstate of the electron in the hydrogenatom is described fully by four quantum numbers ... representation. ref cite journal title Group Dynamics of the HydrogenAtom author Kleinert H. journal ... ref In 1979 the non relativistic hydrogenatom was solved for the first time within R.P. Feynman Feynman ... summary of eigenstates of hydrogenatom main hydrogen like atom Energy levels The energy ... for a hydrogenatom one electron , R is given by math R M frac R infty 1 m mathrm e M , math where ... may be solved analytically in the special case of a two body system, such as the hydrogenatom. The resulting ..., it was essential that the solution of the Dirac equation for the hydrogenatom could ..., not a literal ionized single hydrogenatom. In that case, the acid transfers the proton to H ... atom Isotopes of hydrogen col break Proton decay Quantum chemistry Quantum field theory Quantum mechanics ... 0 13 111892 7 Section 4.2 deals with the hydrogenatom specifically, but all of Chapter 4 is relevant ... physics HydrogenAtom.html Physics of hydrogenatom on Scienceworld http webphysics.davidson.edu ... finley P262 Hydrogen WaveFcns.html The HydrogenAtom Wave Functions, and Probability Density pictures http www.physics.drexel.edu tim open hydrofin Basic Quantum Mechanics of the HydrogenAtom ... more details
interpretation of these quantum numbers Runge Lenz Quantum mechanics of the hydrogenatom this article ...A hydrogen like ion is any atomic nucleus with one electron and thus is isoelectronic with hydrogen . Except for the hydrogenatom itself which is neutral , these ions carry the positive charge e Z 1 , where Z is the atomic number of the atom. Examples of hydrogen like ions are Helium He sup sup , Lithium Li sup 2 sup , Beryllium Be sup 3 sup and Boron B sup 4 sup . Because hydrogen like ions are two particle systems with an interaction depending only on the distance between the two particles, their non relativistic Schr dinger equation can be solved in analytic form. The solutions are one electron functions and are referred to as hydrogen like atomic orbitals . ref In quantum chemistry an orbital is synonymous with a one electron function , a square integrable function of x , y , and z . ref Hydrogen like atomic orbitals are eigenfunction s of the one electron angular momentum operator L ... numbers, but solely on the principal quantum number n . Hence, a hydrogen like atomic orbital is uniquely ... values of the four quantum numbers in electron configuration s of more electron atoms. In hydrogen ... of an atom is a conserved quantity. Many numerical procedures start from products of atomic orbitals ... chemical calculations hydrogen like atomic orbitals cannot serve as an expansion basis, because ... characterization The atomic orbitals of hydrogen like ions are solutions to the particle in a spherically ... axis. See Particle in a spherically symmetric potential Hydrogen like atoms here for the steps leading ... Addition of quantized angular momenta In a real atom the Spin physics spin interacts with the magnetic ... reflist See also Rydberg atom Positronium Exotic atom Two electron atom References Tipler, Paul ... 0 Category Atoms Category Quantum mechanics Category Hydrogen es tomo hidrogenoide fr Hydrog no de it Atomo idrogenoide lt Vandenili kasis atomas ja pl Atom wodoropodobny pt ... more details
. Over 99.94 of an atom s mass is concentrated in the nucleus, ref group note In the case of hydrogen ... patterns of atoms larger than hydrogen. Thus, the planetary model of the atom was discarded in favor ..., the hydrogenhydrogen 1 atom has no neutrons and a positive hydrogen ion has no electrons. The electron ... electron from a hydrogenatom, ref name herter 8 compared to 2.23 million eV for splitting a deuterium ... hydrogenatomHydrogen 1 , the lightest isotope of hydrogen and the atom with the lowest mass, has an atomic ...pp semi small yes Other uses pp move indef Infobox atom The atom is a basic unit of matter that consists ... neutral neutron s except in the case of hydrogen 1 , which is the only stable nuclide with no neutrons . The electrons of an atom are bound to the nucleus by the electromagnetic force . Likewise, a group of atoms can remain bound to each other, forming a molecule . An atom containing ... excess . A positively or negatively charged atom is known as an ion . An atom is Periodic table ... of the element. ref name leigh1990 The name atom comes from the Greek language Greek wikt ..., something that cannot be divided further. ref name liddell scott uncuttable The concept of an atom ... and structure inside the atom, thereby demonstrating that the atom was divisible. The principles of quantum mechanics were used to successfully Scientific modelling model the atom. ref name haubold mathai1998 ... of hydrogen and all other elements have more nucleons than electrons, so the fraction of mass taken by the nucleus is closer to 100 for all of these types of atoms, than for hydrogen 1. ref with protons ... an atom s Magnetism magnetic properties. History Main Atomic theory Atomism Main Atomism The concept .... Nevertheless, the basic idea of the atom was adopted by scientists thousands of years later ... and Atomism Greek atomism Greek concepts of the atom were based purely on philosophy, modern science ... a component of every atom. Thus he overturned the belief that atoms are the indivisible, ultimate ... more details
External links imdb title id 0401091 title A Is for Atom http www.archive.org details isforAto1953 A Is for Atom at Archive.org http www.youtube.com watch?v T6UujimddEc A is for Atom Part 1 on YouTube http www.youtube.com watch?v ekx6gz s5VM A is for Atom Part 2 on YouTube DEFAULTSORT A Is For Atom ... more details
last aired November 18, 2006 status On hiatus num episodes 52 list episodes List of A.T.O.M. episodes website http www.alphateensonmachines.co.uk localise index.html A.T.O.M. an acronym of Alpha Teens ... consist of Axel Manning the main character , List of hero and minor characters in A.T.O.M. Lioness Catalina Leone , List of hero and minor characters in A.T.O.M. King Crey Kingston , List of hero and minor characters in A.T.O.M. Hawk Zack Hawkes , and List of hero and minor characters in A.T.O.M. ... and Latin America , the series is called Action Man A.T.O.M. and has its own comic book from Panini ... army of mutants. Characters main List of hero and minor characters in A.T.O.M. List of villain characters from A.T.O.M. Gear Heroes Alpha Teens Tagblaster, Night Ops Mode, Turbo Board, Earth buggy ... of a motorbike Optical Mechcavator Luis Badlam death machine Episode list List of A.T.O.M. episodes ... Way Laura Thomas F. Wilson Bogey Toyline The A.T.O.M. toyline is an action figure replacement line ... of A.T.O.M. toys. After 2007, the A.T.O.M figures returned to its habitual size. Video Game A video ... 2 . See also Jetix Action Man External links http tv.disney.go.com jetix atom index.html JetixUSA dead link date November 2011 http jetix.co.uk atom JetixUK dead link date November 2011 imdb title ... animation bs A.T.O.M. pl A.T.O.M. Alpha Teens On Machines pt A.T.O.M. ru A.T.O.M. tr A.T.O.M. ... more details
pp semi protected small yes pp move indef Two other uses the chemistry of hydrogen the physics of atomic hydrogenHydrogenatom other meanings Hydrogen disambiguation Infobox hydrogenHydrogen IPAc en .... As the simplest atom known, the hydrogenatom has been of theoretical use. For example, as the only neutral atom with an analytic solution to the Schr dinger equation , the study of the energetics and bonding of the hydrogenatom played a key role in the development of quantum mechanics . Hydrogen ... atom Image hydrogen atom.svg thumb left Depiction of a hydrogenatom with size of central proton shown ... The energy levels of hydrogen can be calculated fairly accurately using the Bohr model of the atom ... Center mirror accessdate 2007 12 20 ref A more accurate description of the hydrogenatom comes from ... atom has acquired a negative or anionic character, denoted H sup sup , and is used when hydrogen forms ..., consisting only of a proton and an electron, the hydrogenatom , together with the spectrum ... the quantum mechanical treatment of the hydrogenatom had been developed in the mid 1920s. One of the first ... E.S.C. chapter Hydrogen title Oxford English Dictionary edition 2nd volume 7 publisher Clarendon Press ... u val 1.007825 u atomic mass unit u for hydrogen 1 , hydrogen is the lightest and abundance of the chemical ... elemental mass. ref cite web last Palmer first D. title Hydrogen in the Universe url http imagine.gsfc.nasa.gov ... dark matter and dark energy ref Star s in the main sequence are mainly composed of hydrogen in its plasma physics plasma state. Naturally occurring elemental hydrogen is relatively rare on Earth. The most common isotope of hydrogen is hydrogen 1 protium name rarely used, symbol sup 1 sup H with a single ... cation is written as though composed of a bare proton, but in reality, hydrogen cations in ionic compound s always occur as more complex species. Hydrogen forms compounds with most elements ... the mixing of metals with strong acids. In 1766 81, Henry Cavendish was the first to recognize that hydrogen ... more details
saved book title Hydrogen subtitle An overview cover image Hydrogen.svg cover color okoko Hydrogen An overview Overview Hydrogen Antihydrogen HydrogenatomHydrogen like atomHydrogen spectral series Liquid hydrogen Solid hydrogen Metallic hydrogen Nascent hydrogen Isotopes Isotopes of hydrogen Deuterium Tritium Spin isomers of hydrogen Reactions Bosch reaction Hydrogen cycle Hydrogenation Dehydrogenation Transfer hydrogenation Hydrogenolysis Hydron chemistry Hydron Sabatier reaction Risks Hydrogen damage Hydrogen embrittlement Hydrogen leak testing Hydrogen safety Fuel Timeline of hydrogen technologies Biohydrogen Hydrogen production Hydrogen infrastructure Hydrogen line Hydrogen purity Category Wikipedia books on natural sciences Category Wikipedia books on chemical elements Category Hydrogen Wikipedia books on elements ... more details
wiktionarypar hydrogen Commons hydrogenHydrogen is a chemical element. Hydrogen may also refer to HydrogenatomHydrogen ion Hydrogen software , drum machine software Hydrogen vehicle Isotopes of hydrogen Deuterium Hydrogen 2 deuterium Tritium Hydrogen 3 tritium Hydrogen 4 Hydrogen 5 See also Hydrogen economy disambig es Hidr geno desambiguaci n gl Hidr xeno hom nimos nl Waterstof ... more details
Unreferenced stub auto yes date December 2009 Orphan date December 2009 In physical chemistry , a hot atom is an atom that has a high translational energy . When molecule AB Adsorption adsorbs on a surface dissociatively, both A and B adsorb on the surface, or only A adsorbs on the surface, and B desorbs from the surface. In case 2, B gains a high translational energy from the adsorption energy of A, and hot atom B is generated. For example, the hydrogen molecule , because of its light mass, gets a high translational energy. Such a hot atom does not fly into vacuum but is trapped on the surface, where it diffuses with high energy. Hot atoms are expected to play important roles in catalysis catalytic reactions . For example, a reaction of a hydrogen atom with hydrogen atoms on a silicon surface and a reaction of an oxygen atom with oxygen molecules on Platinum Pt 111 have been reported. Hot atoms can also be generated by degenerating molecules on a metal surface with Ultraviolet UV light. It has been reported that the reactivity of an oxygen atom generated in such a way on a platinum surface is different from that of chemisorbed oxygen atoms. Elucidating the role of hot atoms on surfaces will lead to a deeper understanding of the mechanism of reactions. DEFAULTSORT Hot Atom Category Physical chemistry Chem stub ar ... more details
Unreferenced date December 2009 Orphan date February 2009 A hydrogen carrier is an organic compound organic macromolecule that transports atom s of hydrogen from one place to another inside a cell or from cell to cell for use in various metabolical process es. An example is NADPH in photosynthesis . See also Electron carrier Light reactions Photosynthesis Cellular respiration DEFAULTSORT Hydrogen Carrier Category Hydrogen biology Biochem stub ja ... more details
Infobox VG title Atom developer Gary Sullivan publisher Tandy Corporation designer Mark Seigel engine N A released 1983 in video gaming 1983 genre Strategy game Strategy , Educational game Educational modes Multi player ratings platforms TRS 80 Color Computer media requirements input Joystick Atom is a home computer game published by Tandy Corporation Tandy in 1983 for the TRS 80 . The game educates the player about the first few Chemical element element s of the periodic table Hydrogen through Xenon . Gameplay The player takes command of a ship presumably a graviton on an x axis plane to collect and shoot electrons at a spinning atom to obtain a new atom. For example, if the player has one electron circling, he or she would shoot another electron in place to make a hydrogen Chemical element element . If the electron misses the target and hits the atomic nucleus nucleus , the atom becomes unstable and blows apart, sending electrons flying around the game screen, and the ship needs to find safety behind barriers located in three of the four corners of the arena. Atom is a timed game with a countdown timer in the upper left corner of the arena timed in nanosecond s actually tenths . Once the timer reaches zero, the atom destabilizes and explodes. External links http nitros9.lcurtisboyle.com atom.html Coco Game List page on Atom Category 1983 video games Category TRS 80 Color Computer games ... more details
A Geonium atom is a false atom created in a magnetic Penning trap . ref L. S. Brown and G. Gabrielse, Geonium theory Physics of a single electron or ion in a Penning trap, Reviews of Modern Physics 58, 233 1986 ref A Penning trap is a combination of a homogeneous magnetic field and an electrostatic quadrupole potential. A single charged particle can be trapped indefinitely in a Penning trap. A small cloud of charged particles in such a trap is like a many electron atom, with the difference that the role of the atomic nucleus is played by an adjustable external field in the trap. In the simplest case, the system consists of only one electron or only one ion in the trap. This is analogous to the hydrogenatom. The properties of this single bound particle, such as the energy levels, g factor and radius of the electron can be measured and calculated with a very high precision. ref cite journal last Dehmelt first Hans title A Single Atomic Particle Forever Floating at Rest in Free Space New Value for Electron Radius journal Physica Scripta year 1988 volume T22 pages 102 110 doi 10.1088 0031 8949 1988 T22 016 bibcode 1988PhST...22..102D ref Hans Dehmelt of the University of Washington created the first Geonium atom in 1973, by quasi permanently trapping an electron. In 1989 he and Wolfgang Paul of Bonn University received the Nobel Prize for Physics for their work on isolating individual electrons and ions and making exact measurements of them. ref cite web url http budker.berkeley.edu Physics138 Miriam Graf Geonium.ppt title Geonium A Fake but Useful Atom Powerpoint Presentation publisher Berkeley accessdate 2010 02 22 ref References reflist physics stub DEFAULTSORT Geonium Atom Category Atomic physics it Atomo geonio ... more details
wiktionarypar atom An atom is a basic unit of matter consisting of a nucleus within a cloud of one or more electrons. Atom may also refer to In mathematics Atom measure theory , a minimal measurable set Atom order theory Atomic formula , a single predicate in first order logic Atom, a Ur element in set theory In computing Acorn Atom , an early 1980s home computer Atom standard , an XML based Web syndication format Atom programming language , a programming language for real time embedded software. Intel Atom , a line of CPUs for ultra mobile devices In entertainment A.T.O.M. , a toy line or its associated animated series Atom game Atom game , a 1983 educational game for the TRS 80 Atom Films , an on line video producer In literature Atom Journey Across the Subatomic Cosmos , a book by Isaac Asimov Atom, the narrator of The History and Adventures of an Atom , a satire by Tobias Smollett Atom comics , superheroes of the DC Universe Captain Atom , a Charlton Comics superhero In music A.T.O.M , an album by Carbon Silicon Atom , a song by British Sea Power Atom, a song by Cannibal Ox from The Cold Vein Atom and His Package , a band whose sole human member is Adam Goren Atom , alias of German musician Uwe Schmidt In other uses Aberoh and AtomAtom , a Christian martyr Ariel Atom , a high performance sports car made by Ariel Ltd Arthur Thomson fanzines or Atom, a science fiction artist Aston Martin Atom , a 1939 prototype car Atom unit , a medieval unit of time Atoms, the sports teams of Annandale High School See also wikibooks A New Model of the Atom Atomic disambiguation Atomicity disambiguation Atomism , philosophy about the basic building blocks of reality Nuclear disambiguation Nuclear power Nuclear weapon disambig ar cs Atom rozcestn k de Atom Begriffskl rung et Atom es Atom fr Atom homonymie ko it Atomic hu Atom egy rtelm s t lap nl Atom ja ru uk zh Atom ... more details
Positronium Di positronium Kaonic hydrogen Neutronium Muonium quantum electrodynamics Mumesic atom ...An exotic atom is an otherwise normal atom in which one or more sub atomic particles have been replaced by other particles of the same charge. For example, electron s may be replaced by other negatively charged particles such as muon s muonic atoms or pion s pionic atoms . ref § 1.8, Constituents of Matter Atoms, Molecules, Nuclei and Particles , Ludwig Bergmann, Clemens Schaefer, and Wilhelm Raith, Berlin Walter de Gruyter, 1997, ISBN 3110139901. ref ref name as http www.accessscience.com abstract.aspx ... lifetimes. Muonic atoms In a muonic atom also called a mu mesic atom , ref http vega.org.uk video ... atom than in an ordinary atom, and corrections due to quantum electrodynamics are more important ... application of muonic atoms. Hadronic atoms A hadronic atom is an atom in which one or more ... in Hadronic Atom Theory , A. Deloff, River Edge, New Jersey World Scientific, 2003. ISBN 9812383719. ref Possible hadrons include meson s such as the pion or kaon , yielding a mesonic atom antiproton s, yielding an antiprotonic atom and the Subatomic particle link yes Sigma particle, yielding a Subatomic particle Sigma or sigmaonic atom . ref p. 8, § 16.4, § 16.5, Deloff. ref ref name ns http media.newscientist.com article mg12717284.600 the strange world of the exotic atom physicists can ... to test theories but also to fight cancer .html The strange world of the exotic atom , Roger Barrett ... name ns Hadronic atoms, such as pionic hydrogen and kaonic hydrogen , thus provide interesting experimental ... 4 . Theorists Reveal Path To True Muonium Never seen Atom. ScienceDaily. Retrieved June 7, 2009. ref ... DEFAULTSORT Exotic Atom Category Exotic atoms Category Quantum chromodynamics cs Exotick atomy de Exotisches Atom es tomo ex tico fa fr Atome exotique ko it Atomo esotico ja pl Atom egzotyczny pt tomo ex tico sl Eksoti ni atom zh ... more details
Mighty Atom may refer to In sports The Mighty Atom athlete , an English athlete The Mighty Atom strongman , a 20th century strongman In television The Japanese name for the popular character Astro Boy Mighty Atom anime Mighty Atom anime , a Japanese animated television series The Mighty Atom Thunderbirds episode The Mighty Atom Thunderbirds episode , the 14th episode of the first season of the Supermarionation television series Thunderbirds TV series Thunderbirds Mighty Atom 1959 TV Series In other fields Mighty Atom Records , a Welsh based record label The Mighty Atom novel The Mighty Atom novel , a book written by Marie Corelli Bruce Forsyth Boy Bruce, the Mighty Atom , an early stage name of the British entertainer Bruce Forsyth disambig nl Mighty Atom ... more details
Cleanup date June 2006 Atom optics or atomic optics is the area of physics which deals with beams of cold, slowly moving neutral atoms, as a special case of a particle beam . Atom optics should not be confused with atomic optics Like an optical beam, the atomic beam may exhibit diffraction and Interference wave propagation interference , and can be focused with a Fresnel zone plate ref name doak cite journal url http www.atomwave.org rmparticle ao 20refs aifm 20refs 20sorted 20by 20topic nano structures fesnell 20zone 20plates DGR99.pdf author R.B.Doak coauthors R.E.Grisenti, S.Rehbein, G.Schmahl, J.P.Toennies, and Ch. W ll title Towards Realization of an Atomic de Broglie Microscope Helium Atom Focusing Using Fresnel Zone Plates journal Physical Review Letters PRL volume 83 issue 21 pages 4229 4232 year 1999 doi 10.1103 PhysRevLett.83.4229 bibcode 1999PhRvL..83.4229D ref or a concave atomic mirror . ref name ccccccc cite journal author J.J.Berkhout coauthors O.J.Luiten, I.D.Setija, T.W.Hijmans, T.Mizusaki, and J.T.M.Walraven title Quantum reflection Focusing of hydrogen atoms with a concave mirror journal Physical Review Letters volume 63 issue 16 pages 1689 1692 year 1989 doi 10.1103 ... ref name uq Atom Optics at the University of Queensland Australia homepage http www.physics.uq.edu.au atomoptics ref . ref name ils Atom Optics, Coherence and Ultra Cold Atoms at the Institute for Laser Science Japan homepage http www.ils.uec.ac.jp Eatomoptics.html ref ref name UCC Atom Optics at the University ... trapping trapping rather than an optics . Recent scientific publications about Atom Nano Optics ... doi 10.1103 RevModPhys.81.1051 bibcode 2009RvMP...81.1051C ref More bibliography about Atom Optics ... Pierre Meystre. Atom Optics ASIN 0387952748 cite journal first Schmidt Kaler last F coauthors T Pfau, P Schmelcher and W Schleich year 2010 title Focus on Atom Optics and its Applications journal ... 2010NJPh...12f5014S DEFAULTSORT Atom Optics Category Atomic, molecular, and optical physics atomic physics ... more details
Chembox verifiedrevid 458288239 ImageFile Hydrogen astatide 3D.png ImageFile Ref chemboximage correct ?? ImageSize 121 ImageName Spacefill model of hydrogen astatide Section1 Chembox Identifiers PubChem 23996 PubChem Ref Pubchemcite correct pubchem ChemSpiderID 22432 ChemSpiderID Ref chemspidercite correct chemspider ChEBI Ref ebicite correct EBI ChEBI 30418 Gmelin 532398 SMILES AtH StdInChI 1S AtH h1H StdInChI Ref stdinchicite correct chemspider InChI 1 AtH h1H StdInChIKey PGLQOBBPBPTBQS UHFFFAOYSA N StdInChIKey Ref stdinchicite correct chemspider InChIKey PGLQOBBPBPTBQS UHFFFAOYAG Section2 Chembox Properties H 1 At 1 ExactMass 211.008 g mol sup 1 sup Section3 Chembox Related OtherCpds Bismuthine br Caesium hydride br Hydrogen bromide br Hydrogen chloride br Hydrogen fluoride br Hydrogen iodide Hydrogen astatide , also known as astatane , or astidohydrogen is a chemical compound with the chemical formula HAt, consisting of an astatine atom covalent ly bonded to a hydrogenatom. ref PubChem, http pubchem.ncbi.nlm.nih.gov summary summary.cgi?cid 23996 astatane Compound Summary , accessed July 3, 2009. ref This chemical compound exhibits properties very similar to the other four hydrogen ... decompose into elemental hydrogen and astatine, ref Fairbrother, Peter, http sci.tech archive.net ..., Academic Press, 1964 ISBN 0120236060 ref dissociation could easily result in the hydrogen carrying the negative charge. Thus, a hydrogen astatide sample can undergo the following reaction 2 HAt H sup sup At sup sup H sup sup At sup sup H sub 2 sub At sub 2 sub This results in elemental hydrogen gas and astatine precipitate . Further, a trend for hydrogen halides, or HX, is that enthalpy of formation ... astatide solution is clearly less stable than the water hydrogen astatine system. Finally, radiolysis ... decay decay into other elements. References reflist Hydrogen compounds Category Astatine Category Hydrogen compounds inorganic compound stub cs Kyselina astatanov it Acido astatidrico nl Waterstofastatide ... more details
A hydrogenatom attached to a relatively electronegativity electronegative atom is a hydrogen bond ..., or nitrogen is a hydrogen bond acceptor, regardless of whether it is bonded to a hydrogenatom ... of a hydrogen bond acceptor which does not have a hydrogenatom bonded to it is the oxygen atom ... in hydrogen bonding when the carbon atom is bound to electronegative atoms, as is the case in chloroform , CHCl sub 3 sub . The electronegative atom attracts the electron cloud from around the hydrogen ... covalent nature of a hydrogen bond raises the following questions To which molecule or atom ... atom. Two molecules of water can form a hydrogen bond between them the simplest case, when only two .... Water is unique because its oxygen atom has two lone pairs and two hydrogen atoms, meaning that the total ... Bifurcated and over coordinated hydrogen bonds in water It can be that a single hydrogenatom participates ..., 3, 526 530 ref It was suggested that a bifurcated hydrogenatom is an essential step in water reorientation ... in formic acid at high pressure GPa . Each hydrogenatom forms a partial covalent bond with two ...Image Hydrogen Bond Quadruple AngewChemIntEd 1998 v37 p75.jpg thumbnail 300px An example of intermolecular hydrogen bonding in a molecular self assembly self assembled dimer complex reported by Meijer ... Hydrogen Bonding year 1998 volume 37 issue 1 2 pages 75 78 doi 10.1002 SICI 1521 3773 19980202 37 1 2 75 AID ANIE75 3.0.CO 2 R ref Image Acac.png thumb 300px Intramolecular hydrogen bonding in acetylacetone helps stabilize the enol tautomer A hydrogen bond is the attractive interaction of a hydrogenatom with an electronegative atom, such as nitrogen , oxygen or fluorine , that comes from another molecule or chemical group . The hydrogen must be covalent bond covalently bonded to another electronegative atom to create the bond. These bonds can occur between molecules intermolecularly , or within different parts of a single molecule intramolecularly . ref GoldBookRef file H02899 title hydrogen ... more details
Context date October 2009 Hydrogen silsesquioxane HSQ is a Photoresist Tone negative tone electron beam resist. The Hydrogen silsesquioxane monomer is a cubical shaped molecule having one Si atom at each corner, with corners being linked via oxygen atoms. Additionally, a hydrogen group is attached to each Si. The formula of the HSQ monomer is H sub 8 sub Si sub 8 sub O sub 12 sub . Thin HSQ layers have been used to show very high resolution 10 nm feature sizes. ref http cat.inist.fr ?aModele afficheN&cpsidt 18807320 ref It can be cross linked by exposure to e beam or EUV radiation with wavelengths shorter than 157 nm. Reference references Category Optical materials material stub ... more details
Borrowing hydrogen catalysis is an important catalytic concept that is based on the intermediate oxidation of an alcohol substrate to the corresponding aldehyde by the catalyst which borrows hydrogen from the substrate the intermediate aldehyde then reacts with e.g. a secondary amine in a condensation reaction to produce e.g. an imine , that is then reduced by the catalyst in the final step to yield e.g. a tertiary amine . ref cite journal doi 10.1002 adsc.200600638 title Borrowing Hydrogen in the Activation of Alcohols year 2007 last1 Hamid first1 Malai Haniti S. A. last2 Slatford first2 Paul A. last3 Williams first3 Jonathan M. J. journal Advanced Synthesis & Catalysis volume 349 issue 10 pages 1555 ref ref Cite thesis degree Ph.D. chapter title Conversion of Alcohols into Amines by Borrowing Hydrogen url http opus.bath.ac.uk 15587 1 UnivBath PhD 2008 MHSA Hamid.pdf author M. Hamid year 2008 publisher University of Bath ref ref cite thesis degree Ph.D. title New Applications of the Borrowing Hydrogen Methodology &mdash Selective Synthesis of Amines and Mechanistic Studies author D. Hollmann degree Dr. rer. nat. url http deposit.ddb.de cgi bin dokserv?idn 993351522&dok var d1&dok ext pdf&filename 993351522.pdf year 2008 ref The method is highly atom economy atom economic , because is circumvents the activation of the alcohol which is a poor electrophile itself, see tosyl ation or Swern oxidation . Borrowing hydrogen can be seen as an example of sustainable thus green chemistry. The method is not limited to the preparation of amines, it can also be used to form C C bonds. ref cite journal journal Tet. Lett. doi 10.1016 j.tetlet.2008.10.059 title C C bond formation from alcohols and malonate half esters using borrowing hydrogen methodology year 2008 last1 Pridmore first1 Simon J. last2 Williams first2 Jonathan M.J. volume 49 issue 52 pages 7413 ref See also Cymene ruthenium dichloride dimer Dichlorotris triphenylphosphine ruthenium II dppf Eschweiler Clarke reaction References ... more details
, the electric potential looks identical to that experienced by the electron in a hydrogenatom ... semiclassical model of the hydrogenatom in which Quantization physics quantized values of angular ... final state. Hydrogenic potential main Hydrogenatom Image CorePolarizationPotential.svg thumb right Figure 2 . A comparison of the potential in a hydrogenatom with that in a Rydberg state of a different atom. A large core polarizability has been used in order to make the effect clear. The black curve is the Coulombic 1 r potential of the hydrogenatom while the dashed red curve includes ... electron feels an almost Hydrogen like atom hydrogenic , Coulomb potential well potential ... pi varepsilon 0a 0 2n 5 . math In the hydrogenatom , the pure 1 r Coulomb potential does not couple ... University of Oulu ref Such a highly excited hydrogenatom on Earth would be ionised almost ... in a hydrogenatom in an electric field E 3 x 10 sup 6 sup V m in the x direction. Note that classically ... momentum converging on the first ionization energy. A Rydberg atom is an excited state excited atom with one or more electron s that have a very high principal quantum number . ref name Gallagher ... Cambridge University Press isbn 0521021669 pages ref These atom s have a number of peculiar properties ... Metcalf cite web url http www.sunysb.edu metcalf rydbergprint.htm title Rydberg Atom Optics accessdate ... 2005 05 31 work publisher Davidson College ref In spite of its shortcomings, the Bohr model of the atom ... of the orbit scales as n sup 2 sup the n 137 state of hydrogen has an atomic radius 1 m and the geometric ... in atomic hydrogen . Three years later the Swedish physicist Johannes Rydberg presented a generalized ... Heisenberg and others. Methods of production The only truly stable state of an atom is the ground ... Rydberg atom experiments relied in charge exchange between a beam of ion s and a population of neutral ... the incident photon is absorbed by the target atom, absolutely specifying the final state energy ... more details
Hydrogen ion is recommended by IUPAC as a general term for all ion s of hydrogen and its isotope s. ref Compendium of Chemical Terminology , 2nd edition McNaught, A.D. and Wilkinson, A. Blackwell Science, 1997 ISBN 0 86542 684 8 , also http www.iupac.org publications compendium index.html online ref Depending on the electric charge charge of the ion, two different classes can be distinguished positively charged ions and negatively charged ions. Under aqueous conditions found in biochemistry , hydrogen ions exist as the hydrated form hydronium , H sub 3 sub O sup sup , but these are often still referred to as hydrogen ions or even proton s by biochemists. Cation positively charged Main Hydron chemistry Image Hydronium 3D balls.png thumb Hydronium ion Image Zundel cation.JPG thumb Zundel cation When hydrogen loses its electron , the following cation s can be formed Hydron chemistry Hydron general name referring to the positive ion of any hydrogen isotope H sup sup Proton sup 1 sup H sup sup i.e. the cation of Hydrogenatom protium Deuteron sup 2 sup H sup sup , D sup sup Triton physics Triton sup 3 sup H sup sup , T sup sup In addition, the ions produced by the reaction of these cations with water as well as their hydrates are called hydrogen ions Hydronium ion H sub 3 sub O sup sup Zundel cation H sub 5 sub O sub 2 sub sup sup named for Georg Zundel Eigen cation H sub 9 sub O sub 4 sub sup sup named for Manfred Eigen Zundel cations and Eigen cations play an important role in proton diffusion according to the Grotthuss mechanism . In connection with acids, hydrogen ions typically refers to Hydron chemistry hydrons . Anion negatively charged main Hydrogen anion Hydrogen anion s are formed when additional electrons are acquired Hydride general name referring to the negative ion of any hydrogen isotope H sup &minus sup Deuteride sup 2 sup H sup &minus sup , D sup &minus sup ... reflist SIA Category Hydrogen physics es I n hidr geno fa id Ion hidrogen sv V tejon ... more details
and not found as the acid in substantial quantities. Hydrogen halides can be abbreviated as HX where H represents a hydrogenatom and X represents a halogen fluorine, chlorine, bromine or iodine ...Hydrogen halides or hydrohalic acids are acids resulting from the chemical reaction of hydrogen with one ... Dipole Molecular dipoles debye D center hydrogen fluoride center center HF center center Image Hydrogen fluoride 2D dimensions.png 68px center center Image Hydrogen fluoride 3D vdW.png 45px center center 91.7 center center 1.86 center center hydrogen chloride center center HCl center center Image Hydrogen chloride 2D dimensions.png 95px center center Image Hydrogen chloride 3D vdW.png 70px center center 127.4 center center 1.11 center center hydrogen bromide center center HBr center center Image Hydrogen bromide 2D dimensions.png 108px center center Image Hydrogen bromide 3D vdW.png 72px center center 141.4 center center 0.788 center center hydrogen iodide center center HI center center Image Hydrogen iodide 2D dimensions.png 110px center center Image Hydrogen iodide 3D vdW.png 84px center center 160.9 center center 0.382 center center astatane hydrogen astatide center center HAt center center Image Hydrogen astatide 3D.png 84px center They are acids because of their ability to deprotonate ... from strong hydrogen bonding in HF, which must be overcome before dissociation is possible ... free energy making dissociation unfavorable . Below HCl however, there is no hydrogen bonding ... ease. Alone of the hydrogen halides, hydrogen fluoride exhibts hydrogen bonding between molecules, and therefore ... to an increase in the frequency and strength of Van der Waals forces. The anhydrous hydrogen halides are all colourless gases at Standard Temperature and Pressure STP except for hydrogen fluoride, which boils at 19 C due to strong hydrogen bonding . Concentrated hydrohalic acid solutions produce visible ... with the dense white fumes formed when the hydrogen halides react with concentrated ammonia ... more details
hydrogen maser, the cavity oscillates by itself. This requires a higher hydrogenatom density ... out of silver plated ceramic, the gain factor is much higher, thereby requiring less hydrogenatom ... in the cavity. This allows the use of lower hydrogenatom density and lower cavity quality factor ...Image Hydrogen maser.jpg right thumb Hydrogen maser A Hydrogen maser , also known as hydrogen frequency standard , is a specific type of maser that uses the intrinsic properties of the hydrogenatom to serve as a precision frequency reference. Both the proton and electron of a hydrogenatom have spins. The atom has a higher energy if both are spinning in the same direction, and a lower energy if they spin ... Laboratory publisher National Institute of Standards and Technology NIST at Hydrogen Maser doi archiveurl archivedate accessdate 2010 04 06 quote ref ref Hydrogen masers are very complex devices and sell .... Image Hmaser.svg left thumb 170px Diagram of a hydrogen maser In both types, a small storage bottle of molecular hydrogen leaks a controlled amount of gas into a discharge bulb. Molecular hydrogen ... into individual hydrogen atoms by an arc. This atomic hydrogen passes through a collimator and a magnetic ... with the wall without perturbation of the atomic state, and slows the recombination of the hydrogen atoms into hydrogen molecules. A durable Teflon & bulb coating technology allows for over 20 year lifetime .... ref http tycho.usno.navy.mil maser.html USNO, Hydrogen Masers ref A weak static magnetic field ... US Patent 5838206 Active Hydrogen Maser Atomic Frequency Standard ref To decrease the influence of changing ... blog hydrogen maser time scale predictability paper title Predictability of a Hydrogen Maser Time ... CH1 75A 08.pdf CHI 75 Active Hydrogen Maser Data Sheet ref With the advent of Ethernet technology, new ... of complex operations. ref name iMaser3000 In the passive hydrogen maser, the cavity is fed ... per year. ref http www.ptfinc.com dsheets 2008 CH1 76A 08.pdf CHI 76 Passive Hydrogen Maser Data ... more details
Kaonic hydrogen is an exotic atom consisting of a negatively charged kaon orbiting a proton . Such particles were first seen, through their X ray spectrum , at the KEK in Tsukuba, Ibaraki Tsukuba , Japan . More detailed studies have been performed at DAFNE in Frascati , Italy . Kaonium has been created in very low energy collisions of kaons with protons. In the experiments called DAFNE exotic atoms research DEAR , kaons were produced by the decay of a Phi meson &phi meson at the &phi factory in DAFNE. The experiment saw X rays from three states in kaonic hydrogen. The ground state binding energy was measured to be 193 37 statistical 6 systematic electronvolt eV . Unlike in the hydrogenatom , where the electron and proton interact only through quantum electrodynamics , kaons and protons interact also by nuclear force s. This results in the atom being metastable , with a very small lifetime. This lifetime is given as a resonance particle physics resonance width of 249 111 statistical 30 systematic electronvolt eV . The lifetime of kaonium is expected to be as low as val 1.18 e 18 u s . External links http cerncourier.com main article 45 6 3 Article in CERN Courier particle stub Category Exotic atoms Category Atomic physics Category Hydrogen physics Category Mesons Category Nuclear physics Category Quantum chromodynamics it Idrogeno kaonico zh K ... more details
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