| Autor: |
S. Matt-Leubner, C. Mair, T. Tepnual, Tilmann D. Märk, Paul Scheier, K. Gluch, W. Schustereder, Aleksandar Stamatovic, Linda Feketeová |
| Předmět: |
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| Zdroj: |
ResearcherID |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
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