Collision-induced absorption in the region of the ν2 + ν3 band of carbon dioxide

Abstract

The IR absorption spectra of pure carbon dioxide in the region of the forbidden ν2 + ν3 vibrational transition at 3004 cm−1 have been recorded using a Fourier-transform spectrometer. A multipass-optical cell with the path length of 100 m was used in the study. The data were taken at room temperature of 294.8 K with a resolution of 0.02 cm−1 over the spectral region 2500–3500 cm−1. A sample pressures varied from 207 to 463 kPa (2.04–4.57 atm). The measured binary absorption coefficients provide the band integrated intensity value of (2.39 ± 0.04) ∗ 10−4 cm−2 amagat−2. The result is compared with those from previous works. The observed band profile features are discussed.