Accession Number:

ADA159682

Title:

Investigation of the Spatially Isotropic Component of the Laterally Averaged Molecular Hydrogen/Ag(111) Physisorption Potential.

Descriptive Note:

Interim technical rept.,

Corporate Author:

CHICAGO UNIV IL JAMES FRANCK INST

Report Date:

1985-08-01

Pagination or Media Count:

72.0

Abstract:

A comprehensive study of the spatially isotropic component of the laterally averaged molecular hydrogenAg111 physisorption potential is presented. Diffractive selective adsorption scattering resonances for rotationally state-selected H2 and D2 on Ag111 have been mapped out as a function of incident polar angle for several crystal azimuths and beam energies. These resonances have been used to determine the bound eigenvalues, and subsequently the shape, of the potential well. Best fit Lennard-Jones, Morse, variable exponent, and exponential-3 potentials having well depths of approximately 32 meV are derived from the data. These measurements are supported by rotationally inelastic scattering measurements for HD and exact close-coupled quantum scattering calculations. Debye-Waller attenuation measurements are also presented for H2, D2, and HD. The ability to detect these diffractively coupled resonances on a closest-packed metallic surface, i.e. a surface of extremely low corrugation, suggests that such measurements can be carried out on a much wider class of surfaces than previously envisioned. Originator supplied keywords include Gas-surface interaction potentials selective adsorption para-hydrogen generation gas-surface scattering resonances.

Subject Categories:

  • Particle Accelerators
  • Quantum Theory and Relativity

Distribution Statement:

APPROVED FOR PUBLIC RELEASE