Collision-induced absorption (CIA) by CO2 is measured in the 1100–1600 cm−1range using a Fourier-transform spectrometer with a resolution of 0.5 cm−1. The current measurements, which agree well with previous ones but are more precise, reveal pronounced structures on top of both unresolved Fermi doublet bands consisting of P-, Q-,and R-like branches. Assignment of Q-branches at 1284.75 cm−1and 1387.75 cm−1to (CO2)2 dimers seems highly probable. The nature of other peaks observed in CIA and Raman spectra of the CO2 Fermi doublet region is discussed.
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