1989
DOI: 10.1103/physrevb.39.3104
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Theory of ortho-para conversion in hydrogen adsorbed on metal and paramagnetic surfaces at low temperatures

Abstract: In order to explain the experimental results on Cu(100), Ag(111), Ag thin films, graphite, and H2 bubbles in Cu, the ortho-para conversion rates of H2 and D2 adsorbed on metal and paramagnetic surfaces at low temperatures have been considered. The conversion rates due to magnetic dipoledipole, Fermi contact, and spin-orbit interaction between the conduction electrons, and nuclear spins of H2 (D2) are calculated to elucidate the role of the metal surface. Although the rates on clean metal surfaces are found to … Show more

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Cited by 30 publications
(11 citation statements)
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“…Astonishingly, the role of a continuous series of states, electron bands, on the conversion of hydrogen interacting with a solid, has never been studied sufficiently. At one exception, the silver metallic case was interpreted on the basis of a (111) surface state and a short portion of the surface band around the Fermi level was taken into account [ 28 ] (an early oversimplified calculation failed to obtain the observed orders of magnitude [ 43 ]). For the fast metallic rates, there is no distinction between the electron and nuclear families, because the most important electron excitations involve nuclear o – p energies.…”
Section: Electromagnetic Channels and Materialsmentioning
confidence: 99%
“…Astonishingly, the role of a continuous series of states, electron bands, on the conversion of hydrogen interacting with a solid, has never been studied sufficiently. At one exception, the silver metallic case was interpreted on the basis of a (111) surface state and a short portion of the surface band around the Fermi level was taken into account [ 28 ] (an early oversimplified calculation failed to obtain the observed orders of magnitude [ 43 ]). For the fast metallic rates, there is no distinction between the electron and nuclear families, because the most important electron excitations involve nuclear o – p energies.…”
Section: Electromagnetic Channels and Materialsmentioning
confidence: 99%
“…affect the processes of surface diffusion of particles (molecules, atoms, ions), which are magnetic dipoles on the surface. Of particular interest are the studies of diffusion and chemisorption processes for induced magnetic dipoles adsorbed on the surface of transition metals [6,[18][19][20][21][22], which are effective catalysts. They are relevant because the analysis of semiphenomenological [23][24][25][26][27] and statistical models (the "lattice gas" models) [28] for description of CO oxidation kinetics shows that the surface quantum nature and interaction of CO, O 2 molecules and oxygen atoms with the catalyst surface both have a magneto-dipole nature and can cause the formation of CO clusters on the catalyst surface [29].…”
Section: Introductionmentioning
confidence: 99%
“…Mathematical models of such processes are constructed on the basis of reaction-diffusion equations, obtained phenomenologically or semi-phenomenologically using certain statistical approaches [2] with mainly experimentally determined rates of adsorption, desorption, diffusion and chemical reactions [3]. In particular, the processes of carbon monoxide (CO) oxidation on platinum (Pt) surface are described using equations of chemical kinetics based on the ZGB model [4,5].…”
Section: Introductionmentioning
confidence: 99%