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The kinetic isotope effect in the chemical reduction of sulphate to sulphide was investigated over the temperature range from 18 to 50°C. S32O:-was found to react 2.2 % faster than S340:-, in agreement with theoretical calculations based on statistical mechanical methods.

The reactions of the C3He+ molecule-ion in the propylene and cyclopropane systems have been studied as a function of ion exit energy in a single-stage mass spectrometer. The yields of the products 03 +, C4H7+ C4H8+, and C5H3+ decrease markedly with increasing ion energy with a number of low mass products, C3H6+, C3H4+, C3H3+ and, in low yield, C2 ions, being formed at high ion energies. The yield curves for each of these latter products show definite energy thresholds characteristic of endothermic reactions and comparison of these thresholds with calculated reaction heats provides some information on the reactions occurring.

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