Abstract

The ratio of the collision cross section for self broadening to that for foreign-gas broadening has been measured for each of 21 rotational lines in the R branch of the CO fundamental. This ratio has the same value for all lines with N2 as the broadener; the masses of CO and N2 molecules are equal. For monatomic and diatomic broadeners such as H2, D2, He, and Ne with masses less than that of CO, the ratio is greater for lines near the band center than for lines in the band wing; the reverse is the case for monatomic broadeners such as Ar, Kr, and Xe with masses greater than that of CO. The experimental results are tentatively interpreted in terms of an existing theory that makes a distinction between adiabatic collisions and nonadiabatic collisions involving transitions between adjacent rotational states of the CO molecules.

© 1968 Optical Society of America

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