Equivalent widths of the 2.7- and 4.3-µm CO2 bands have been measured at high pressures up to 50 atm. These equivalent widths can be expressed by the empirical equation of the form W = cumPne. The line-by-line calculations for the equivalent width showed that the empirical values of Winters et al., [“Line Shape in the Wing Beyond the Band Head of the 4.3 µm Band of CO2,” J. Quant. Spectrosc. Radiat. Transfer 4, 527–537 (1964)] are also applicable to our high pressure experiments for the 4.3-µm CO2 band. Using the curve-of growth method, the band intensities of the 5.2-,9.4-, and 10.4-µm CO2 bands were estimated to be 0.0199 cm-2 atm-1 STP, 0.0340 cm-2 atm-1 STP and 0.0208 cm-2 atm-1 STP, respectively.
Mikihiko Hirono and Tsuyoshi Suda, "Equivalent widths and band intensities of CO2," Appl. Opt. 29, 608-614 (1990)