M. A. FLORY AND L. M. ZIURYS, Department of Chemistry, Department of Astronomy, Steward Observatory, University of Arizona, Tucson, AZ 85721.
The pure rotational spectra of VN (X 3 r) and VO (X 4 -) in their ground electronic states have been recorded in the frequency range 295-525 GHz. In each case, seven rotational transitions were measured. Fine structure and vanadium hyperfine splittings were resolved in these data. These radicals were produced by reacting gas-phase VCl4 with N2 (VN) or residual O2 (VO) in an AC discharge. Rotational, fine, and hyperfine constants were determined. In particular, the hyperfine constants a , b , and c for VN have been established from a global fit to the spectra. The parameters obtained are in good agreement with previous studies.