The abundance of CH4 in the earth's atmosphere was determined by assuming an effective temperature for the atmosphere of 250°K. The lines R(0) and P(2) of the 2ν3 band were used since they are sensibly single and are easily broadened so that the total integrated intensity can be determined. The result of 1.11±0.16 cm·atm (NTP) is in good agreement with previously published results obtained by using less realistic effective temperatures.
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Fink et al. (1964) studied this question.
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