Low-vibrational-levelP(J)υ,υ'CO laser emissions have been measured from He-air-CH4mixtures. The CW lines below 5.0μ were measured in air to occur at 4.8836, 4.8935, 4.8974, 4.9072, 4.9366, 4.9466, 4.9670, and 4.9778μ. These emissions are tentatively identified to result from transitions as low asυ = 3 : 2. Such emissions were relatively more frequent with CH4than with CO specifically.
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Barry et al. (1971) studied this question.
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