Abstract

The 1–0, 2–0, 3–0, 4–0, and 5–0 bands of HCl35 and the 1–0 and 2–0 bands of DCl35 have been measured with high precision. A critical analysis has been made to determine the rotational and vibrational constants of these molecules. It is necessary to use a polynomial in m of the sixth degree to satisfactorily represent the frequencies of the band lines in the case of the most precisely measured bands. B0 for HCl35 has been found to have a value of 10.440254±0.000010 cm−1. B0 for DCl35 was found to be 5.392261±0.000010 cm−1. When the B0 obtained for DCl35 is combined with the microwave measurement of B0 by Cowan and Gordy the value obtained for the velocity of light c=299 793.1±0.65 km/sec. The observed rotational and vibrational constants (Ylj) have been used to calculate the potential constants of HCl35 by making use of Dunham’s theory of a rotating vibrator. It is shown that HCl35 is not a pure rotating vibrator since the observed and calculated values of Y02~De are in disagreement by about 1 part in 1000 which is approximately 10 times the experimental error. By making use of the molecular constants for HCl35 and DCl35 and the accurately known atomic masses it is deduced that the ground level Be is perturbed by the upper electronic levels by 1 part in 8000. The sign of the perturbation is to increase Be over its unperturbed value. The sign of the perturbation is such that it may be presumed the HCl molecule has a positive magnetic moment. It was calculated that μJ=+0.2 and +0.1 nuclear magnetons, respectively, for HCl35 and DCl35.

© 1962 Optical Society of America

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