Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5415875 | Journal of Molecular Spectroscopy | 2008 | 9 Pages |
Abstract
The pure rotational spectra of VN (X3Îr) and VO (X4Σâ) have been recorded in the frequency range 290-520 GHz using direct absorption spectroscopy. These radicals were synthesized in the gas-phase from the reaction of VCl4 with either N2 or H2O in an AC discharge. Seven rotational transitions were recorded for each molecule; in both sets of spectra, fine and hyperfine structures were resolved. The data sets for VN and VO were fit with Hund's case (a) and case (b) Hamiltonians, respectively, and rotational, fine structure, and hyperfine constants determined. For VN, however, an additional hyperfine parameter, Îa, was necessary for the analysis of the Ω = 2 sublevel to account for perturbations from a nearby 1Î state, in addition to the usual Frosch and Foley constants. Determination of Îa suggests that the 1Î state lies â¼3000 cmâ1 above the ground state. In VO, the hyperfine structure in the F2 and F3 components was found to become heavily mixed due to an avoided crossing, predicted by previous optical studies to be near the N = 15 level. The hyperfine constants established for these two molecules are consistent with the proposed Ï1δ1 and Ï1δ2 electron configurations.
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Authors
M.A. Flory, L.M. Ziurys,