Abstract
Far infrared emission spectrum of Δ v=1 bands of KCl has been observed in the range from 230 to 295 cm −1 with a resolution of 0.1 cm −1. Vibration-rotation transitions of the 1-0, 2-1, 3-2 and 4-3 bands of K 35Cl were analyzed by a single least-squares fit to a set of seven Dunham coefficients Y ij . Y 10 and Y 20 for K 35Cl were determined to be 279.963 (22) cm −1 and −1.2306(83) cm −1, respectively, with the standard errors in parentheses. Characteristic features of the far infrared emission spectroscopy of high-temperature molecules have been discussed.
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