The Rates of Specific Quenching Channels

The Rates of Specific Quenching Guumels. The quenching of excited noble gas atoms can occur by a variety of reaction channels, as discussed in Section 1. While a certain channel may be readily detected, it is less easy to establish the fraction of the total reaction which it represents. An example concerns competition between two-body channels for quenching of excited atoms in noble gas afterglows  

In several studies, either atomic emission from A or molecular emission from 

FA Flowing afterglow PR pulse radiolysis EB high-energy electron beam ES elastic scattering. 

Part B kiifPi). (10 x Rate constant/cm molecule section/given in parentheses) 

A has been observed and the precursor state A identified by comparing the decay profiles of the emission intensity and the concentration of A. However, the rate of decay of A is determined by the sum of the two channels and further information, rarely obtained, is required to determine the rate of the observed channel. For this reason, much of the reported rate data concerning these channels must be treated with caution this point is taken up again in Section 3. 

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Discussion of Rate Data.— The measurements of the rates of specific quenching channels are now beginning to give some insight into the products of the quenching process, but it is less certain to what extent the channel determines the rate of reaction. Numerous models have been proposed to explain the measured total quenching rate constants, some based on the observed reaction channels " and others considering only the dynamics of the approach of the reactants. - As more information... 

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