CH4 fragmentation from single and double ionization by proton and electron impact
| Autor: | Wania Wolff, H. Luna, E. C. Montenegro, L. Sigaud |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Delayed extraction
Physics Proton Double ionization Electron 01 natural sciences Molecular physics 010305 fluids & plasmas Fragmentation (mass spectrometry) Ionization 0103 physical sciences Physics::Atomic and Molecular Clusters Nuclear Experiment 010306 general physics Electron ionization Excitation |
| Zdroj: | Physical Review A. 99 |
| ISSN: | 2469-9934 2469-9926 |
| Popis: | The fragmentation of methane by impact of electrons and protons is studied experimentally to reveal the mechanisms behind fragmentation by projectiles with opposite charges. Coincidence measurements are used to separate the single from double ionization, in the case of protons, and the DETOF (delayed extraction time-of-flight) technique is used, in the case of electrons, to untangle kinematic signatures of the single vacancy from that of the one-electron--two-vacancy satellite states populated during the collision. The substantial differences in the fragmentation cross sections observed between the two projectiles, when several hydrogen bonds are broken, are here attributed essentially to single ionization and interpreted as due to the interference term between the mechanisms of shakeup and the excitation ionization by double impact that appears in the perturbative expansion of the ionization cross section. |
| Databáze: | OpenAIRE |
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