Tracing multiple scattering patterns in absolute(e,2e)cross sections forH2and He over a4πsolid angle
| Autor: | Michael S. Pindzola, Alexander Dorn, Igor Bray, Thomas Pflüger, Ola Al-Hagan, Don H. Madison, James Colgan, Joachim Ullrich, Xueguang Ren, Arne Senftleben, Dmitry Fursa |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Physical Review A. 82 |
| ISSN: | 1094-1622 1050-2947 |
| DOI: | 10.1103/physreva.82.032712 |
| Popis: | Absolutely normalized ($e,2e$) measurements for ${\mathrm{H}}_{2}$ and He covering the full solid angle of one ejected electron are presented for 16 eV sum energy of both final state continuum electrons. For both targets rich cross-section structures in addition to the binary and recoil lobes are identified and studied as a function of the fixed electron's emission angle and the energy sharing among both electrons. For ${\mathrm{H}}_{2}$ their behavior is consistent with multiple scattering of the projectile as discussed before [Al-Hagan et al., Nature Phys. 5, 59 (2009)]. For He the binary and recoil lobes are significantly larger than for ${\mathrm{H}}_{2}$ and partly cover the multiple scattering structures. To highlight these patterns we propose a alternative representation of the triply differential cross section. Nonperturbative calculations are in good agreement with the He results and show discrepancies for ${\mathrm{H}}_{2}$ in the recoil peak region. For ${\mathrm{H}}_{2}$ a perturbative approach reasonably reproduces the cross-section shape but deviates in absolute magnitude. |
| Databáze: | OpenAIRE |
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