Rotational analysis of the d 3Δi-a 3 Πr transition of carbon monosulfide

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Abstract
Use of a new emission source facilitated recording the near infrared spectrum of the d 3Δi-a 3Πr transition of the CS radical. Eleven bands have been analysed (v' = 5-12, v" = 0-2). Intersystem transitions to the ground state have previously given information mainly on the Ω = 1 components. The new spectra provide experimental data on the Ω≠ 1 components. As a result of the deperturbation treatment of the vibronic levels involved in the d-a transition, improved values are obtained for the true spin-orbit and parity-dependent spin-spin parameters. They have been compared with the corresponding theoretical values. The study of second order perturbations of the 3Δ sublevels allowed an estimate of the energy of the 1Δ state not previously identified. The deperturbed constants for the a 3Π and d 3Δ states are the following : (all data in cm-1).[MATHS]