Strengths, Widths, and Shapes of the Lines of the 3ν CO Band

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Abstract
Spectral curves of several CO samples have been used to investigate the 3ν band whose center is near 6350 cm−1. The strength of the band for the common 12C16O isotope has been found to be 0.0130±0.0005 atm−1·cm−1STP·cm−1. An empirical equation, Fm=1+0.011m, has been derived to account for the influence of vibration—rotation on line strengths. The half‐widths of the self‐broadened lines at 1 atm pressure vary from approximately 0.090 cm−1 at | m | = 1 to 0.062 cm−1 at | m | = 20. The widths of self‐broadened lines are 1.08±0.005 times as great as N2‐broadened lines at the same pressure. The Lorentz line shape appears to be appropriate for the collision‐broadened lines within a few cm−1 of their centers; but the extreme wings of the lines are sub‐Lorentzian.

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