Abstract
Overtone absorption lines of 12C 16O 2 have been examined by using a tunable diode laser (TDL) spectrometer in the region around 12 770 cm - 1 . The spectrometer sources are commercially available double heterostructure InGaAlAs TDLs operating in the “free-running” mode, which allowed the detection of the line positions within 0.01 cm - 1 . The observed carbon dioxide absorption lines belong to the ν 1 + 5 ν 3 ro-vibrational band with rotational quantum number J up to 48. The minimum absorbance detected by the spectrometer ( ≃ 5 × 10 - 6 ) permitted to observe the weakest lines having the absorption cross section of the order of ≃ 1 × 10 - 27 cm 2 / molecule .
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