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Inelastic neutron scattering from H2 on vapour deposited CO2

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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.

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Authors and Affiliations

  1. Fachbereich Chemie der Universität Siegen, 57068, Siegen, Germany

    A. Knipp, W. Langel & E. Knözinger

  2. Institut Laue-Langevin, BP 156, 38042, Grenoble Cedex 9, France

    H. Mutka

Authors
  1. A. Knipp
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  2. W. Langel
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  3. H. Mutka
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  4. E. Knözinger
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Additional information

Received: 15 October 1996 / Revised: 25 August 1997 / Accepted: 24 October 1997

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Knipp, A., Langel, W., Mutka, H. et al. Inelastic neutron scattering from H2 on vapour deposited CO2 . Eur. Phys. J. B 3, 109–117 (1998). https://doi.org/10.1007/s100510050289

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  • DOI: https://doi.org/10.1007/s100510050289

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