Enhanced Kinetic Ftir Observation Of Transient Species Generated In SITU By Pulsed Laser Photolysis

M. S. Paquette; H. D. Gafney; M. S. Darsillo

doi:10.1117/12.970906

20 December 1985 Enhanced Kinetic Ftir Observation Of Transient Species Generated In SITU By Pulsed Laser Photolysis

M. S. Paquette, H. D. Gafney, M. S. Darsillo

Proceedings Volume 0553, Fourier and Computerized Infrared Spectroscopy; (1985) https://doi.org/10.1117/12.970906
Event: 1985 International Conference on Fourier and Computerized Infrared Spectroscopy, 1985, Ottawa, Canada

Abstract

Modern, rapid scanning FTIR spectrometers allow efficient real time sampling of time dependent phenomena such as chromatographic peak elution and chemical reactions. We have particular interest in kinetic and mechanistic studies of catalytic reactions as well as rapid chemical reactions. Using appropriate reactor-cells, we have the potential for observing in situ the existence and fate of short lived species. However, these transient materials, by virtue of their reactivity, are usually difficult to observe in their unenhanced amounts. We have developed techniques which employ ultraviolet, visible, and infrared laser pulses to stimulate reactions in solutions and on surfaces enhancing the occurrence of reactive species. We will present results of an in situ FTIR study of the laser photolysis of iron pentacarbonyl in homogeneous solu-tion and on a porous vycor glass support. An analysis of spectral data from several experiments enabled us to identify reactive iron subcarbonyl species as well as stable compounds and clusters. Spectral stripping procedures were used to quantitate individual components in the kinetic FTIR spectra yielding catalyst lifetimes as short as 0.2 sec. From these experiments we have postulated comprehensive models describing chemical, photochemical, and physical processes in stoichiometric and catalytic reactions of iron carbonyl complexes.

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M. S. Paquette, H. D. Gafney, and M. S. Darsillo "Enhanced Kinetic Ftir Observation Of Transient Species Generated In SITU By Pulsed Laser Photolysis", Proc. SPIE 0553, Fourier and Computerized Infrared Spectroscopy, (20 December 1985); https://doi.org/10.1117/12.970906

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KEYWORDS

FT-IR spectroscopy

Iron

Photolysis

Chemical reactions

Pulsed laser operation

Infrared lasers

Laser development

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