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62P1/2 ↔ 62P3/2 excitation transfer in cesium, induced in collisions with CH4 and CD4 molecules, has been studied in relation to the temperature of the vapour–gas mixtures. The variation with temperature of the cross section ratio Q(CH4)/Q(CD4) is ascribed to an isotope effect which is interpreted on the basis of the theory of absolute reaction rates.

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