Rate parameters for reaction of atomic selenium with ethylene

Abstract

Atomic selenium was monitored in flashed CSe₂ by kinetic absorption spectroscopy, and its rate of reaction with ethylene was measured in the temperature range 302–412°K. The rate of appearance of a new spectrum in the far ultra-violet was symmetrical with the atomic decay, and was tentatively assigned to ethylene selenide. The rate constants were expressed as k= 1.8±0.60×10^–11 exp (–2810±200 (cal)/RT)cm³ sec^–1 molecule^–1. Ethylene was shown to be a very efficient third body for atomic selenium recombination, apparently because of a fast abstraction of the selenium atom from ethylene selenide to regenerate ethylene. A number of olefin selenide spectra were listed.