The Exchange of Hydrogen and Deuterium in the Presence of Electrons and Ultraviolet Radiation

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Abstract
The mechanism for the radiation-induced exchange of hydrogen and deuterium in the presence of rare gases is studied from considerations of the individual ion molecule reaction rate constants and energy changes. A mechanism is proposed which involves H3+ as the ion chain carrier, with rare gas inhibition by the formation of RH+, where R is a rare gas. Moderate inhibition is caused by reaction with H2+, and marked inhibition is caused by reaction with H3+. Rare gases fall into 2 sets: He, Ne, and Ar, showing moderate inhibition at moderate concentrations, and Kr and Xe, showing marked inhibition even at trace concentrations. For the first set, the reaction RH+ + H2[forward arrow] RH+ + H followed by the reaction RH+ + H2[forward arrow] R + H3+ is energetically possible and causes enhancement of the reaction. The reaction is studied in the simultaneous presence of ultraviolet and electron radiations. There is an interaction between the ion and radical reactions and that the increased presence of hydrogen atoms inhibits the ion reaction. The reaction may terminate by the neutralization of ion molecule clusters with free electrons.

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