A more precise formula of the Hill and Van Vleck type is developed for the rotational levels of the components of doublet states in diatomic molecules. An additional rotational constant H8 is accurately included in the development. New values of the molecular constants of the A 2A-X 211 system of CH are obtained using the smoothed data of Ger6 and of Kiess and Broida. The spin-coupling constants Y of both states are found to vary with the rotational quantum number. Subject headings: molecules - spectra, molecular
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Brian Krupp (1974) studied this question.