Frequency measurements of 9- and 10-/spl mu/m N/sub 2/O laser transitions

We have measured frequencies of N/sub 2/O transitions by heterodyning sub-Doppler fluorescence-stabilized N/sub 2/O laser radiation with that from a reference CO/sub 2/ laser. A high-resolution cavity incorporates a ribbed tube and a highly reflective grating, permitting the CW oscillation of both the 10/sup 0/0-02/sup 0/0 9-/spl mu/m and the 10/sup 0/0-00/sup 0/1 10-/spl mu/m regular bands. This is the first sub-Doppler frequency measurement of the 9-/spl mu/m band. The accuracy in the determination of the rotational constants for both bands has been improved by an order of magnitude, and calculated transition frequencies are presented.