OBSERVATION OF TRIPLET-TRIPLET ABSORPTION BY MEANS OF A VIDICON-BASED SPECTROMETER
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Date
1973
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Ohio State University
Abstract
Observation of triplet-triplet absorption (TTA) by an organic molecule is usually effected by high-powered flashlamps or by continuous excitation with a high-power are lamp. While the flash techniques allow the kinetics to be studied, many repetitive experiments are required to yield spectral information. A continuous irradiation experiment allows one to scan the spectrum, but is limited in its ability to do kinetic analysis. During all of these procedures, there exists the danger of generating photo-products which could obscure the desired information. The use of a spectrometer with a vidicon image-tube detector allows one to obtain both spectral and kinetic information simultaneously and to minimize the possibility of generating photoproducts. The spectrum is scanned rapidly by means of an electron beam and allows one to observe the triplet-triplet absorption spectrum and to follow its decay at all absorption wavelengths simultaneously. Such a spectrometer can be useful with both pulsed and continuous excitation techniques, yielding full spectral and kinetic information in both cases. Comparison of TTA lifetimes with phosphorescence lifetimes is also quite conveniently done. The gathering and processing of the data can be greatly improved by the use of a minicomputer in conjunction with the spectrometer.
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Author Institution: Analytical Instruments Tektronix, Inc.