Abstract

A new technique combining supersonic jet expansion and transient frequency-modulation absorption experiments has been successfully developed for spectroscopic investigations of free radicals. The A ̃ ← X ̃ transition spectra of NH 2 and HCCl at near-infrared wavelengths have been obtained using this technique for demonstration. In addition, a combination of temporal waveform acquisition and frequency scan using this new technique has produced interesting information on the velocity and density distributions of supersonic jet expansion systems.

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