HIGH RESOLUTION SPECTROSCOPY AND PHOTOPHYSICS OF TRANSITION METAL CONTAINING DIATOMIC MOLECULES: THE VISIBLE SPECTRUM OF VANADIUM NITRIDE
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Date
1989
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Ohio State University
Abstract
The electronic spectrum of vanadium nitride has been studied in a molecular beam apparatus by laser-induced fluorescence. Rotational temperatures of ca. 25-30 K have been observed. Several electronic transitions have been observed at low resolution $(0.1 cm^{-1})$ in the 4000-7500 A region. These have all been assigned. The (0,0) band of the $D^3\Pi(\pi^{1}_{3d} \delta^{1}_{3d})-X^3\Delta(\sigma^1_{**} \delta^{1}_{3d})$ system is centered near 6240 A and has been investigated at high resolution (120 MHz). The nuclear magnetic hyperfine structure which arises from the interaction of a metal centered unpaired electron (chiefly the $\sigma_{5**}$ electron) with the magnetic nucleus of vanadium (I-7/2) has been resolved and a preliminary analysis will be presented. Besides the three case (a) allowed sub-bands, which are very prominent, three weak satellite bands could be observed at high resolution and their analyses permitted the triplet splittings to be determined. A transition centered near 6165 A has been ascribed as the (0,0) band of the $d^{1}\Sigma^{\ast}-x^{3}\Delta_{1}$ intercombination system. This band has been investigated at high resolution and a rotational analysis has been completed.
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Author Institution: Laser Chemistry Group, Division of Chemistry, National Research Council of Canada