Abstract

We describe the most recent implementation of the data acquisition system which we have developed for fast time-resolved (FTR) Fourier transform spectroscopy (FTS) and report spectra that were obtained by using this instrument. This FTRFTS data system operates in conjunction with any continuous-scan Michelson interferometer, giving it the capability to record many time-delayed spectra of a transient event, with a minimum time resolution of 1 μs. The sensitivity and the spectral resolution of the complete system are the same as those that would be obtained if the interferometer were used in conventional steady-state spectroscopy. To illustrate the performance of the FTRFTS system, we recorded emission spectra from the products of transient chemical reactions of H atoms with CF3Cl, CF2Cl2, CFCl3, and NO2. These are laser-initiated reactions involving atoms with energies that correspond to a temperature of approximately 27,000 K and lifetimes of a few microseconds, but the FTRFTS system records the time evolution of their products with high signal-to-noise ratio.

© 1996 Optical Society of America

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