THE MERCURY-PHOTOSENSITIZED DECOMPOSITION OF AMMONIA AND AMMONIA–PROPANE MIXTURES

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Abstract
A study of the mercury-photosensitized decomposition of ammonia, both with pure ammonia and with propane added as a scavenger for hydrogen atoms, suggests that the quantum yield of the primary decomposition into H and NH2 is much less than unity at 33 °C and rises with increasing temperature. The interaction of ammonia–propane mixtures with Hg 6(3P1) atoms cannot be explained in terms of simple competitive quenching; a tentative mechanism involving a long-lived Hg 6(3P1) – propane complex and Hg 6(3P0) atoms has been suggested. A temperature dependence in the relative quenching rates of C3H8 and C3D8 has also been observed.

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