Abstract
The cw dye laser excitation spectrum of the A ̃ 2A 1(000) ← X ̃ 2B 1(000) vibronic transition of the PH 2 radical was observed between 18 158 and 18 443 cm −1 at Doppler-limited resolution. The PH 2 radical was produced by the reaction of discharged hydrogen with powdered red phosphorus. About 1000 lines were observed for K a up to 7 and N up to 9. Using the ground-state parameters reported by Endo et al. [Y. Endo, S. Saito and E. Hirota, J. Mol. Spectrosc., 97 (1983) 204–212], upper-state term values were calculated from the observed transition frequencies and were subjected to a least-squares analysis to derive rotational constants, centrifugal distortion constants, and spin-rotation interaction constants in the A ̃ state. The perturbations observed for the upper state are briefly discussed.
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