Abstract

The first spectrum of vanadium has been observed in the 1.0–5.6µm extraphotographic infrared region by means of Fourier spectroscopic techniques. These observations have produced measurements for about 450 infrared V I lines and preliminary analysis has led to a revision and extension of the spectroscopic terms arising from the 3<i>d</i><sup>5</sup> configuration. The <sup>4</sup><i>F</i> term at about 37 000 cm<sup>-1</sup> formerly ascribed to 3<i>d</i><sup>5</sup> has been reassigned to 3<i>d</i><sup>4</sup>4<i>s</i>. The lowest term of the 3<i>d</i><sup>5</sup> configuration, <sup>6</sup><i>S</i><sub>5/2</sub> at 20 202.47 ± 0.05 cm<sup>-1</sup> has been reaffirmed by means of high-precision infrared measurements. In addition, three probable new 3<i>d</i><sup>5</sup> terms, <sup>4</sup><i>G</i> at about 34 200 cm<sup>-1</sup>, <sup>4</sup><i>P</i> at about 33 000 cm<sup>-1</sup> and <sup>2</sup><i>F</i> at about 35 700 cm<sup>-1</sup> have been tentatively identified.

© 1978 Optical Society of America

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