Accession Number : ADA295014

Title :   Sum Frequency Study of Lanqmuir-Blodgett Films on Single Gold Crystals: A Comparison of Chemisorbed and Physisorbed Systems.

Descriptive Note : Technical rept. Jun 94-May 95,

Corporate Author : OREGON UNIV EUGENE DEPT OF CHEMISTRY

Personal Author(s) : Messmer, Marie C. ; Richmond, G. L.

PDF Url : ADA295014

Report Date : 12 JUN 1995

Pagination or Media Count : 29

Abstract : The sum frequency rotational anisotropy signal from a single crystal gold with multiple Langmuir-Blodgett layers of chemisorbed and physisorbed molecules is examined. Using polarization selection and rotational anisotropy of the sum frequency signal, various portions of the non-linear response have been examined. These measurements show that it is possible to separate the resonant, non-resonant, and interaction components of the nonlinear response of these systems. It is showr that the dominant contribution to the nonlinear response by a chemisorbed species on gold is due to the bonding interaction with the surface. The dominant contribution to the nonlinear response by a physisorbed species on gold is from the resonant component from molecular resonances. This technique is shown to be useful as a probe of the type of the surface interaction of adsorbed layers on crystalline gold.

Descriptors :   *SOLID STATE CHEMISTRY, *CHEMISORPTION, POLARIZATION, INTERACTIONS, LAYERS, ADSORPTION, SINGLE CRYSTALS, NONLINEAR SYSTEMS, ANISOTROPY, BONDING, MOLECULAR ROTATION, SURFACE CHEMISTRY, GOLD, SELECTION.

Subject Categories : Physical Chemistry
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE