
Accession Number : ADA118789
Title : Rotationally Mediated Selective Adsorption as a Probe of Isotropic and Anisotropic Molecule  Surface Interaction Potentials: HD(J)/Ag(111).
Descriptive Note : Interim technical rept.,
Corporate Author : CHICAGO UNIV IL JAMES FRANCK INST
Personal Author(s) : Yu,ChienFan ; Hogg,Charles S ; Cowin,James P ; Whaley,K Birgitta ; Light,John C
PDF Url : ADA118789
Report Date : Aug 1982
Pagination or Media Count : 44
Abstract : Rotationally mediated selective adsorption scattering resonances are used to make an experimental and theoretical study of the laterally averaged interaction potential between HD and a weakly corrugated system, Ag(111). The experimentally observed resonances determine the vibrational levels of the HD/Ag(111) physisorption potential as a function of bound rotational state. These vibrational levels show Jdependent shifts due to the orientational anisotropy of the potential. Exact quantum scattering calculations using a full laterally averaged potential of the form V sub o(z,0) = v sub o (z) (1 + beta P sub 2 (cos theta)) have been carried out to obtain rotationally inelastic transition probabilities. Experimental and theoretical resonance energies are compared for two forms of v sub o(z), a Morse and a variable exponent potential, as a function of Beta, and are found to be very close to the first order perturbed energies of a free rotor in bound states of v sub o(z). Both potential forms give equally good fits to the data, yielding an optimum value of the asymmetry parameter, Beta approx. 0.05. The determination of Beta is relatively insensitive to small changes in the v sub o(z) well depth. (Author)
Descriptors : *Molecular rotation, *Absorption, *Probes, *Inelastic scattering, Anisotropy, Asymmetry, Interactions, Perturbations, Energy, Transitions, Probability, Quantum statistics
Subject Categories : Nuclear Physics & Elementary Particle Physics
Distribution Statement : APPROVED FOR PUBLIC RELEASE