Abstract
A spectroscopic setup designed for high resolution spectroscopy of jet cooled molecules is described. The primary features of the new setup are an exceedingly low gas consumption and a high detection efficiency, which are achieved by optimizing the detection geometry of the time gated fluorescence in combination with a special piezo valve. This makes the setup particularly suitable for studying expensive gases that come in small supply. The performance of the setup is demonstrated on the first A 2 B 2 ← X 2 A 1 rovibronic transitions of 15 N 16 O 2 measured in a jet. A rotational analysis is given for a couple of different bands. In addition, an exceptionally strong band with band origin around 14 850 cm −1 is reported that is of interest particularly for atmospheric applications. The 15 N 16 O 2 gas consumption is as low as 0.025 mg or 0.5 μmol/cm −1 spectral range.
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