Inelastic neutron scattering from H2 on vapour deposited CO2 View Full Text


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Article Info

DATE

1998-05

AUTHORS

A. Knipp, W. Langel, H. Mutka, E. Knözinger

ABSTRACT

: Inelastic neutron scattering spectra at 17 meV and 68 meV incident energies of molecular hydrogen adsorbed on vapour deposited substrates of pure CO2, 90:10 and 50:50 CO2:Kr are reported. The ortho-para transition is shifted from 14.7 meV in the free H2-molecule to 9.4 meV in a presumably commensurate ortho-H2 monolayer on the CO2 surface. The quadrupole-quadrupole interaction of ortho-H2 molecules with the CO2 substrate results in a strongly anisotropic potential. In addition to rotations the dynamics of this layer comprise a local Einstein mode and phonons in resonance with the substrate, giving rise to intense multiphonon transitions. Quasielastic scattering on warmer samples is assigned to a liquidlike adsorption layer, in which the H2 rotations are strongly perturbed. More... »

PAGES

109-117

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s100510050289

DOI

http://dx.doi.org/10.1007/s100510050289

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1039274308


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