A Photoacoustic Study of Chemically Active Systems.
PRINCETON UNIV NJ APPLIED PHYSICS AND MATERIALS LAB
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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.
- Atomic and Molecular Physics and Spectroscopy