Abstract
A novel corona-excited supersonic jet slit discharge is described, and its use as a source of rotationally cold free radicals for infrared direct absorption spectroscopy is discussed. The system was tested by detecting the rovibrational spectrum of CS and by observing the ν 2 band of NH 2X̃ 2B 1. Two different phase sensitive detection schemes were used. Although conventional frequency modulation of the infrared laser was successfully employed, a new population modulation scheme was more effective. Under the conditions described, rotational temperatures of the detected fragments were ≈40 K.
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