Surface residence time measurements of transient methyl radicals

K. A. Briggman; P. C. Stair; E. Weitz

doi:10.1016/S0009-2614(00)01448-2

Surface residence time measurements of transient methyl radicals

K. A. Briggman, P. C. Stair, E. Weitz

Northwestern University

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

We present the first measurement of the thermal desorption kinetics of methyl radicals. Neutral methyl radicals are photochemically produced within a methyl iodide film condensed on MgO(100). A substantial fraction become trapped through inelastic collisions with the film and thermalize to the film temperature prior to desorption. Novel residence time measurements are made by comparing neutral and ion flight times in a time-of-flight spectrometer. An Arrhenius analysis of methyl radical residence times provides a desorption barrier of 2.5±0.5kcalmol^-1 and a pre-factor of 10^10±1s^-1.

Original language	English
Pages (from-to)	1-6
Number of pages	6
Journal	Chemical Physics Letters
Volume	334
Issue number	1-3
DOIs	https://doi.org/10.1016/S0009-2614(00)01448-2
Publication status	Published - Feb 2 2001

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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AB - We present the first measurement of the thermal desorption kinetics of methyl radicals. Neutral methyl radicals are photochemically produced within a methyl iodide film condensed on MgO(100). A substantial fraction become trapped through inelastic collisions with the film and thermalize to the film temperature prior to desorption. Novel residence time measurements are made by comparing neutral and ion flight times in a time-of-flight spectrometer. An Arrhenius analysis of methyl radical residence times provides a desorption barrier of 2.5±0.5kcalmol-1 and a pre-factor of 1010±1s-1.

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