Accession Number : ADA134663

Title :   A Photoacoustic Study of Chemically Active Systems.

Descriptive Note : Final rept.,


Personal Author(s) : Royce,B S H

Full Text :

Report Date : Sep 1983

Pagination or Media Count : 26

Abstract : The method of gas-microphone photoacoustic spectroscopy and the related photothermal deflection spectroscopy have been developed for application to chemically active systems. Fourier Transform Infrared Photoacoustic Spectroscopy has been used to study surface reactions on zeolites and photopolymerization reactions in acrylates. In both cases the chemical reactions were initiated in the photoacoustic cell and followed in situ. The catalytic studies were carried out in a cell with a high temperature capability of 400 C and cell design permitted gas flows through the cell during data acquisition. The photopolymerization experiments were conducted at room temperature but employed control of the gas phase above the sample to evaluate the effects of oxygen radicals on surface photopolymerization. Photothermal deflection spectroscopy has been applied to the study of electrode electrolyte interfaces during electrochemical or photoelectrochemical reactions. Surface spectroscopic studies made in situ have enabled corrosion processes to be followed and an extension of the technique using concentration gradient produced signals has permitted charge transfer to electrolyte ions and electrode dissolution processes to be followed.

Descriptors :   *Chemical analysis , *Spectroscopy , Chemical reactions , Polymerization , Electrolytes , Photothermal properties , Surface reactions , Electrochemistry , Fourier spectroscopy , Infrared spectroscopy , Catalysis

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE