MICROWAVE-SPECTRUM OF THE NS RADICAL IN THE (2)PI(GAMMA) GROUND ELECTRONIC-STATE

The microwave spectrum of the NS radical in the ground electronic state has been remeasured in the frequency region of 69 to 350 GHz for the astronomical use. Measurement errors for most of the observed lines were less than 20 kHz so that the observed laboratory frequencies are readily usable for the rest frequencies of NS for astronomical use. The molecular constants including the rotational constant and its centrifugal distortion constant, the Delta-type doubling constants, and the hyperfine coupling constants of the nitrogen nucleus have been determined more precisely, when compared with those reported previously.