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

^*Corresponding author for this work

Chemistry

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

8 Scopus citations

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 (US)
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
State	Published - Feb 2 2001

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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10.1016/S0009-2614(00)01448-2

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title = "Surface residence time measurements of transient methyl radicals",

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 1010±1s-1.",

author = "Briggman, {K. A.} and Stair, {P. C.} and E. Weitz",

note = "Funding Information: The authors gratefully acknowledge support for this work by the National Science Foundation under Grant No. CHE-9305937. K.A.B. wishes to thank Frederick Northrup and Peter Doan for stimulating discussions and to acknowledge a National Physical Science Consortium fellowship.",

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T1 - Surface residence time measurements of transient methyl radicals

AU - Briggman, K. A.

AU - Stair, P. C.

AU - Weitz, E.

N1 - Funding Information: The authors gratefully acknowledge support for this work by the National Science Foundation under Grant No. CHE-9305937. K.A.B. wishes to thank Frederick Northrup and Peter Doan for stimulating discussions and to acknowledge a National Physical Science Consortium fellowship.

PY - 2001/2/2

Y1 - 2001/2/2

N2 - 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.

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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JO - Chemical Physics Letters

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Surface residence time measurements of transient methyl radicals

Abstract

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