Results are presented for photoelectric scans of the C₂ 1 to 0 band head at 4737 A at resolutions of 0.14 to 0.50 A in the comet Kohoutek. On the basis of medium-resolution scans and of one high-resolution scan two values are obtained for the C-12/C-13 ratio which are consistent within the experimental errors with the terrestrial values of C-12/C-13 equal to 89. The study also demonstrates the limitations imposed by NH2 blends.
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Danks et al. (1974) studied this question.