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The integrated intensities of five rotational lines in the Q branch of the (0, 0) band of the CH + ( 1 II- 1 Σ) cometary system have been determined accurately by a laboratory excitation in a high frequency discharge. From these data, the `effective rotational temperature' of the source has been determined. The results are discussed in relation to possible thermal equilibrium in the source giving the `true temperature' of the gas, and in relation to the measurements of McKeller from cometary spectra by intensity study.
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N. Sreedhara Murthy (1963) studied this question.
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