Accession Number:

ADA159726

Title:

Investigation of the Spatially Anisotropic Component of the Laterally Averaged Molecular Hydrogen/Ag(III) Physisorption Potential.

Descriptive Note:

Interim technical rept.,

Corporate Author:

CHICAGO UNIV IL JAMES FRANCK INST

Report Date:

1985-08-01

Pagination or Media Count:

93.0

Abstract:

A detailed investigation of the spatially anisotropic component of the laterally averaged molecular hydrogenAg111 physisorption potential is presented. Experimentally derived rotationally inelastic transition probabilities for H2, D2, and HD, taken as a function of collision energy, are compared with those resulting from close-coupled quantum scattering calculations. These calculations utilize exponential-3 and variable exponent parameterizations of the laterally averaged isotropic potential which reproduce the experimental bound state resonance spectra for p-H2 and o-D2 on Ag111. Complementary information is obtained by analyzing the magnetic sub-level splittings for physisorbed J 1 n-H2, using diffractive selective adsorption resonance energies calculated with first order perturbation theory. Theoretical predictions for HDAg111 rotationally mediated selective adsorption resonances are also compared with previously reported experimental results, which show well resolved J-dependent energy shifts resulting in part from the orientational anisotropy of the potential. The results obtained in this study indicate that both the attractive and repulsive parts of the anisotropic potential exhibit only a weak orientation dependence, in agreement with recent theoretical predictions for this system. Originator supplied keywords include Gas-surface interaction potentials spatially anisotropic forces rotationally inelastic gas-surface scattering selective adsorption gas-surface scattering resonances close-coupled scattering calculations.

Subject Categories:

  • Particle Accelerators
  • Quantum Theory and Relativity

Distribution Statement:

APPROVED FOR PUBLIC RELEASE