Abstract

A newly designed two-dimensional corona-excited slit nozzle discharge is described and its first applications for direct absorption spectroscopy of molecular ions in a supersonic expansion in the infrared (NO +) and far-infrared (N 2H +). The results are discussed and it will be shown that under the conditions described, for N 2H + linewidths of 750 kHz and rotational temperatures of 12 K can be achieved.

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