The 2111/2, j = A-doublet transition of CH has been detected in emission in the direction of Cas A, at a frequency of 3349.185 MHz. For an assumed 10 percent population inversion the CH/H abundance ratios in the Orion and Perseus arm clouds are 3 X I0- and 1 , respectively, if the observed line is the F = 1 1 hyperfine component. heading: molecules, interstellar
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Turner et al. (1974) studied this question.
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