Abstract
Rotational level populations of N 2 have been measured in free jets of He + N 2 mixtures by an electron beam technique. The experimental data are compared with kinetic calculations, based on theoretical state-to-state rate constants, obtained by the IOS method with an M3SV potential energy surface. Reasonable agreement of the data substantiates the IOS method down to low (≈ 10 K) temperatures. Other available calculations of rotational relaxation times are compared with the present experimental data.
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