Accession Number:

ADA295107

Title:

Molecular and Ionic Interactions at the Oil/Water Interface as Measured by Surface Second Harmonic Generation and Sum-Frequency Generation.

Descriptive Note:

Technical rept. Jun 94-May 95,

Corporate Author:

OREGON UNIV EUGENE DEPT OF CHEMISTRY

Personal Author(s):

• Richmond, G. L.
• Conboy, John C.
• Messmer, Marie C.

Report Date:

1995-06-12

Pagination or Media Count:

4.0

Abstract:

Direct measurement of molecular properties of these fluid interfacial regions remains a challenging task. In recent years we have been applying two techniques to such problems, surface second harmonic generation SHG and sum-frequency generation SFG. The success that we have had in making measurements of the structural and molecular properties of a variety of neat hydrocarbonwater interfaces and dichloroethanewater interfaces has come from employing a total intenal reflection geometry TIR. We have examined interfacial order, molecular orientation and ionic adsorption at various of water interfaces with TIR SHG and TIR SFG. The results provide a valuable insight into how molecules and ions interact at these fluid interfaces.

Descriptors:

• *INTERFACES
• *SECOND HARMONIC GENERATION
• *CHLOROETHANES
• *MONOMOLECULAR FILMS
• IONS
• MEASUREMENT
• WATER
• ORIENTATION(DIRECTION)
• REFLECTION
• GEOMETRY
• MOLECULAR STRUCTURE
• OILS
• MOLECULAR PROPERTIES

Subject Categories:

• Physical Chemistry
• Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE