Cross sections and ion kinetic energies for electron impact ionization of CH4

被引：43

作者：

Gluch, K ^{[1
]}

Scheier, P ^{[1
]}

Schustereder, W ^{[1
]}

Tepnual, T ^{[1
]}

Feketeova, L ^{[1
]}

Mair, C ^{[1
]}

Matt-Leubner, S ^{[1
]}

Stamatovic, A ^{[1
]}

Märk, TD ^{[1
]}

机构：

[1] Univ Innsbruck, Inst Ionenphys, A-6020 Innsbruck, Austria

来源：

INTERNATIONAL JOURNAL OF MASS SPECTROMETRY | 2003年 / 228卷 / 2-3期

基金：

奥地利科学基金会;

关键词：

cross sections; ion kinetic energy; electron impact ionization; CH4;

D O I：

10.1016/S1387-3806(03)00199-4

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

Total and partial cross sections for electron impact ionization of CH4 were measured from threshold to 1000 eV. Ion kinetic energy distributions were measured applying a deflection and retarding field method. The extraction of ions from the ion source was simulated fully three-dimensionally including the presence of a magnetic field for electron guidance. Thereby, discrimination factors were determined as a function of the initial ion kinetic energy. Multiplication of these factors with the ion signal leads to relative partial cross sections. By normalizing the sum of these partial cross sections to an absolute value taken from the literature, absolute partial cross sections were obtained that agree well with previous measurements where a complete collection of the product ions has been demonstrated. Moreover, with the present method, it is possible to determine cross sections that are differential with respect to the initial kinetic energy of the ion. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

页码：307 / 320

页数：14

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