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 = cu^mPⁿ_e. 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.

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