Abstract
To determine the isotopomer abundance ratio of 13CH4 to 12CH4 by infrared absorption spectroscopy, we selected the ν3 P(6) A1 transition of 13CH4 at 2947.6970 cm-1 and the ν2+ν4 R(6) F1 transition of 12CH4 at 2947.4246 cm-1, which simultaneously satisfy six necessary and desirable conditions, including the higher absorption intensity for the less abundant species, no overlapping with other spectral lines, and small temperature dependence. Then, from the recorded spectra of these transitions using a widely tunable spectrometer based on a difference-frequency-generation light source, we determined the absorption coefficient ratio from the individual absorbance with a precision of 0.3%.
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