MICROWAVE-SPECTRA OF THE ZNH AND ZND RADICALS IN THE X(2)SIGMA(+) STATE

Rotational spectra of zinc monohydride and deuteride in the X(2) Sigma (+) vibronic ground state were observed by using a source-modulated su bmillimeter-wave spectrometer. The zinc hydride or deuteride radical w as generated in the heat-pipe stainless steel cell by de glow discharg e in a mixture of zinc vapor and H-2 or D-2 gas, respectively. Five to six fine and hyperfine components of the N = 1-0 transition of zinc m onohydrides for the three isotopic species of Zn-64, Zn-66, and Zn-68 were measured in the frequency region of 380 to 400 GHz, and 10 to 14 components of the N = 1-0 and 2-1 transitions of deuterides were measu red in the frequency regions around 200 and 400 GHz, respectively. The molecular constants including the rotational constants, centrifugal d istortion constants, spin-rotation coupling constants with their centr ifugal distortion terms, and hyperfine coupling constants for the hydr ogen and deuterium nuclei were precisely determined. (C) 1991 Academic Press, Inc.