NEAR-INFRARED DIODE LASER ABSORPTION SPECTROSCOPY OF THE JET-COOLED $N_{2}$ ION

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1994

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Ohio State University

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The absorption spectrum of the (2, 0) vibrational band of the $A^{2}\Pi_{u} - X^{2}\Sigma_{g}^{+}$ system of the nitrogen molecular ion generated by discharge in the pulsed supersonic jet expansion has been observed by near-infrared diode laser spectroscopy. Signal-to-noise ratio greater than 40 at an effective time constant of 0.1 sec was obtained using the discharge modulation technique followed by dual-gated integration synchronous with a pulsed nozzle. The rotational temperature of the $N_{2}^{-}$ ion was typically 50 K in the discharge plasma in the pulsed supersonic jet expansion.

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Author Institution: Department of Chemistry, Faculty of Science, Kyushu University

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