Spin—Orbit Coupling Constant of Nitric Oxide. Determination from Fundamental and Satellite Band Origins

Abstract

Precise measurements of the band origins of the 2Π½—2Π½ and ∏212−∏212 subbands of the fundamental of nitric oxide and of the band origin of the 1–0 ∏212−∏212 satellite band provides accurate values for the spin—orbit coupling constants A0 and A1 for the v=0 and v=1 vibrational levels. The values obtained are A0=123.160 cm—1 and A1=122.911 cm—1. When these results are combined with the results of Olman, McNelis, and Hause, precise values of A2 and A3 are also obtained. They are A2=122.658 cm—1 and A3=122.360 cm—1. Causes for the discrepancy in A values calculated from other investigators' results are discussed. Certain discrepancies in rotational constants obtained from this and other infrared studies are pointed out and briefly discussed.