Accession Number : ADA019669

Title :   Semiconductor Surface Chemistry.

Descriptive Note : Final rept. 1 Oct 71-30 Sep 75,

Corporate Author : ILLINOIS UNIV AT URBANA-CHAMPAIGN COORDINATED SCIENCE LAB

Personal Author(s) : Ehrlich,Gert

Report Date : OCT 1975

Pagination or Media Count : 32

Abstract : As a result of the studies under this grant, four important aspects of the interactions between molecular gases with crystals have been clarified: (1) Chemisorption of hydrogen on perfect low-index planes of both an fcc material, rhodium, as well as of a bcc metal, tungsten, has been investigated for the first time. (2) It has been established that decomposition of a polyatomic molecule can be brought about at a cold surface merely by thermal excitation of the gas. (3) Diffraction of beams of hydrogen molecules has for the first time been observed from ionic crystals with a (111) surface, as well as from an oxide. (4) The binding site of a metal atom on its own crystal lattice has been established.

Descriptors :   *Semiconductors, *Surface chemistry, *Chemisorption, Crystal defects, Crystal lattices, Scattering, Molecular structure, Adsorption, Decomposition, Excitation, Diffraction, Evaporation, Molecules, Hydrogen, Rhodium, Tungsten, Methane

Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE