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Inelastic neutron scattering from H_2 on vapour deposited CO_2

机译:H_2在气相沉积CO_2上的非弹性中子散射

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摘要

Inelastic neutron scattering spectra at 17 meV and 68 meV incident energies of molecular hydrogen adsorbed on vapour deposited substrates of pure CO_2, 90:10 and 50:50 CO_2:Kr are reported. The ortho-para transition is shifted from 14.7 meV in the free H_2-molecule to 9.4 meV in a presumably commensurate ortho-H_2 monolayer on the CO_2 surface. The quadrupole-quadrupole interaction of ortho-H_2 molecules with the CO_2 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 H_2 rotations are strongly perturbed.
机译:报道了在纯氢CO_2、90:10和50:50 CO_2:Kr的气相沉积基底上吸附的分子氢在17 meV和68 meV入射能量下的非弹性中子散射光谱。邻位对位转变从游离H_2分子中的14.7 meV转变为CO_2表面上相应的邻位H_2单层中的9.4 meV。邻位H_2分子与CO_2底物的四极-四极相互作用产生强烈的各向异性势。除旋转外,该层的动力学还包括局部爱因斯坦模式和与基底共振的声子,从而引起强烈的多声子跃迁。在较热的样品上的准弹性散射被分配给类似液的吸附层,在该层中H_2旋转受到强烈干扰。

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