Samples of CO2 at pressures up to 21.3 atm and with paths as long as 1067 m have been employed to measure CO2 absorption between 1100 and 1835 cm-1. Most of the absorption is due to the ν1 and 2ν2 bands. These bands are forbidden for the symmetric 16O12Cl6O and 16O13C16O molecules and, therefore, produce only pressure-induced absorption. The asymmetric 16O12C18O and 16O12C17O molecules produce bands that contain components of both intrinsic and pressure-induced absorption. The integrated-absorption coefficient for the intrinsic absorption is 1.08 × 10-22 (±10%) molecules -l cm2 cm-1. The integrated pressure-induced absorption coefficient is 1.68×10-22 (±8%) molecules-1 cm2 atm-1 cm-l.
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