Mass spectrometric measurements in free jets of argon and carbon dioxide showed that small amounts of various solute species caused large decreases in the terminal concentration of host gas dimers. This dimer depletion by solute species cannot be accounted for by thermodynamic changes in the state of the jet gas, e.g., temperature, pressure, and concentration. Nor can it be explained by conventional kinetic factors such as relative cross sections for collision frequency and energy exchange. The most likely explanation seems to lie in the unique density distribution in free jets which allows the destruction of dimers by two-body processes in the later stages of the expansion after their earlier formation by three-body encounters in the region of high density.
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Yamashita et al. (1981) studied this question.
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