The infrared transmittance of carbon dioxide has been calculated over a wide range of path lengths, pressures, and temperatures from 500 to 10,000 cm-1. Values of the transmittance are given at intervals of 2.5 cm-1. In addition, transmittance values are also given which have been averaged over larger intervals. All contributing spectral lines whose relative intensity is greater than 10-8 that of the strongest line in any particular band have been included in the calculation. In addition, the contributions from the eight major isotopic species have been included. The calculation of the vibrational energy levels included terms through the third power of the vibrational quantum number and also the effects of Fermi resonanse. The final transmittance tables were generated using the the quasi-random model of molecular band absorption.
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Total absorptance ∫ A(ν)dν has been determined as a function of absorber concentration w and equivalent pressure Pe for the major infrared absorption bands of carbon dioxide with centers at 3716, 3609, 2350, 1064, and 961 cm-1. The results in the 875-495 cm-1 region are expressed in terms of mean spectral absorptance Ā(ν1 − ν2) = ∫ ν1 ν2 A(ν)dν/(ν1 − ν2) for five separate subregions. The effects of temperature variations on absorption in some regions are discussed. Estimates of band intensity ∫ k(ν)dν are given for each band and are compared with the results of others.
