FOURIER TRANSFORM EMISSION SPECTROSCOPY OF NEW ELECTRONIC TRANSITIONS OF VN AND VO
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Date
2001
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Ohio State University
Abstract
The emission spectra of VN and VO have been investigated in the $3700-18300 cm^{-1}$ region using a Fourier transform spectrometer. The spectra of both these species were observed in the same experiment from the microwave excitation of $VOCl_{3}$ vapor in active nitrogen. Several new bands were observed and assigned to new electronic transitions of VN and VO. For VN, two new electronic transitions were observed with their 0-0 bands near $14293 cm^{-1}$ and $5267 cm^{-1}$. These transitions have been assigned as the $c^{1}\Pi - a^{1}\Delta$ and $d^{1}\Sigma^{+} - b^{1}\Sigma^{+}$ transitions, respectively. The $d^{1}\Sigma^{+}$ state of VN is the only known singlet state to date which was seen previously from the $d^{1}\Sigma^{+} - X^{3}\Delta^{1}$, transition near $16220 cm^{-1}$ by Simard et al. [J. Mol. Spectrosc. 136,44 (1989)]. For VO, the $1^{2}\Phi - 1^{2}\Delta$ transition near $5545 cm^{-1}$ has been observed for the first time, although the $1^{2}\Phi$ and $1^{2}\Delta$ states have previously been seen by Merer et al. [J. Mol. Spectrosc. 125, 465, (1987)] from other transitions. A rotational analysis of the new bands provides valuable information on the low-lying electronic states of VN and VO.
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Author Institution: University of Arizona; Department of Chemistry, University of Waterloo; Department of Chemistry, University of California