Sum Frequency Study of Lanqmuir-Blodgett Films on Single Gold Crystals: A Comparison of Chemisorbed and Physisorbed Systems.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 12, 1995
- Accession Number
- ADA295014
Entities
People
- Geraldine L. Richmond
- Marie C. Messmer
Organizations
- University of Oregon