TIME EVOLUTION OF SHORT-LIVED MOLECULAR SPECIES OBSERVED BY INTRACAVITY LASER ABSORPTION SPECTROSCOPY
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Date
1983
Journal Title
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Volume Title
Publisher
Ohio State University
Abstract
We report the feasibility of using CW intracavity laser absorption spectroscopy (ICLAS)$^{1}$ as a probe in detecting transient species generated by pulsed laser photolysis. The method of detection uses a time-generated CW laser beam and time-resolved spectra which are delayed with respect to the photolysis pulse. Variable time delays and a constant generation time have been used to detect the time dependence of the absorbing species at times as short as a few microseconds. We applied the technique to the study of the time evolution of the formation of the free radical HCO generated by photolysis of gas-phase acetaldehyde $(CH_{3}CHO)$ at pressures down to tens of mtorr. We have also found that the ultimate sensitivity of the ICLAS technique is limited mainly by the mechanical stability of the cavity. $^{1}$M. Chenevier, M. A. Melieres, F. Stoeckel, to be published $^{2}$G. H. Atkinson, A. H. Laufer and M. J. Kurylo, J. Chem. Phys. 59 (1973) 350. $^{3}$G. H. Atkinson, T. M. Heimlich and M. W. Schuyler, J. Chem. Phys. 66 (1977 5005. $^{4}$ A. J. Gill and G. H. Atkinson, Chem. Phys. Letters, 64 (1979) 426. $^{5}$R, J. Gill, W. D. Johnson and G. H. Atkinson, Chem. Phys. 58 (1981) 29.
Description
Author Institution: Laboratoire de Spectcometrie Physique Universite Scientifique et Medicale de Grenoble BP68 38042, Saint Martin d'Heres; Department of Chemistry, Davidson College, Davidson; Department of Chemistry, Syracuse University Syracuse