Abstract
Laser excitation spectra of the A2Σ-X2Πi system have been recorded for 63CuS and 65CuS isotopic molecules with a single-mode dye laser operating in the region 17000–18000 cm−1. For highly overlapped sequences, use of a monochromator as a narrow band filter was necessary to allow rotational analysis. A simultaneous fit of all eight analyzed bands has led to the following spectroscopic constants for 63CuS (in cm−1): StatevTvBvDv × 106γvpvav × 106A2Σ−017924.335 (7)0.17989 (4)0.177 (7)0.03853 (7)X2Π121842.574 (7)0.18701 (4)0.163 (7)0.01496 (9)0432.566 (6)0.18818 (4)0.162 (7)0.01508 (9)X2Π321411.289 (7)0.18724 (4)0.184 (7)−0.96 (6)0—0.18839 (4)0.160 (7)−0.11 (6) (Numbers in parentheses are 3σ uncertainties.) Indirect configuration assignments combined with spectroscopic analysis lead to a Σ− symmetry for the upper state.
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