Indirect contributions to electron-impact ionization of Li+ (1s2s S1 3) ions: Role of intermediate double- K -vacancy states
Fine details of the cross section for electron-impact ionization of metastable two-electron Li+ (1s2s 3S1) ions are scrutinized by both experiment and theory. Beyond direct knockoff ionization, indirect ionization mechanisms proceeding via formation of intermediate double-K-vacancy (hollow) states e...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Published: |
2018
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| Online Access: | http://hdl.handle.net/20.500.11937/68032 |
| _version_ | 1848761723963572224 |
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| author | Müller, A. Borovik, A. Huber, K. Schippers, S. Fursa, Dmitry Bray, Igor |
| author_facet | Müller, A. Borovik, A. Huber, K. Schippers, S. Fursa, Dmitry Bray, Igor |
| author_sort | Müller, A. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Fine details of the cross section for electron-impact ionization of metastable two-electron Li+ (1s2s 3S1) ions are scrutinized by both experiment and theory. Beyond direct knockoff ionization, indirect ionization mechanisms proceeding via formation of intermediate double-K-vacancy (hollow) states either in a Li+ ion or in a neutral lithium atom and subsequent emission of one or two electrons, respectively, can contribute to the net production of Li2+ ions. The partial cross sections for such contributions are less than 4% of the total single-ionization cross section. The characteristic steps, resonances, and interference phenomena in the indirect ionization contribution are measured with an experimental energy spread of less than 0.9 eV and with a statistical relative uncertainty of the order of 1.7%, requiring a level of statistical uncertainty in the total single-ionization cross section of better than 0.05%. The measurements are accompanied by convergent-close-coupling calculations performed on a fine energy grid. Theory and experiment are in remarkable agreement concerning the fine details of the ionization cross section. Comparison with previous R-matrix results is less favorable. |
| first_indexed | 2025-11-14T10:36:13Z |
| format | Journal Article |
| id | curtin-20.500.11937-68032 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:36:13Z |
| publishDate | 2018 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-680322018-12-04T05:25:18Z Indirect contributions to electron-impact ionization of Li+ (1s2s S1 3) ions: Role of intermediate double- K -vacancy states Müller, A. Borovik, A. Huber, K. Schippers, S. Fursa, Dmitry Bray, Igor Fine details of the cross section for electron-impact ionization of metastable two-electron Li+ (1s2s 3S1) ions are scrutinized by both experiment and theory. Beyond direct knockoff ionization, indirect ionization mechanisms proceeding via formation of intermediate double-K-vacancy (hollow) states either in a Li+ ion or in a neutral lithium atom and subsequent emission of one or two electrons, respectively, can contribute to the net production of Li2+ ions. The partial cross sections for such contributions are less than 4% of the total single-ionization cross section. The characteristic steps, resonances, and interference phenomena in the indirect ionization contribution are measured with an experimental energy spread of less than 0.9 eV and with a statistical relative uncertainty of the order of 1.7%, requiring a level of statistical uncertainty in the total single-ionization cross section of better than 0.05%. The measurements are accompanied by convergent-close-coupling calculations performed on a fine energy grid. Theory and experiment are in remarkable agreement concerning the fine details of the ionization cross section. Comparison with previous R-matrix results is less favorable. 2018 Journal Article http://hdl.handle.net/20.500.11937/68032 10.1103/PhysRevA.97.022709 restricted |
| spellingShingle | Müller, A. Borovik, A. Huber, K. Schippers, S. Fursa, Dmitry Bray, Igor Indirect contributions to electron-impact ionization of Li+ (1s2s S1 3) ions: Role of intermediate double- K -vacancy states |
| title | Indirect contributions to electron-impact ionization of Li+ (1s2s S1 3) ions: Role of intermediate double- K -vacancy states |
| title_full | Indirect contributions to electron-impact ionization of Li+ (1s2s S1 3) ions: Role of intermediate double- K -vacancy states |
| title_fullStr | Indirect contributions to electron-impact ionization of Li+ (1s2s S1 3) ions: Role of intermediate double- K -vacancy states |
| title_full_unstemmed | Indirect contributions to electron-impact ionization of Li+ (1s2s S1 3) ions: Role of intermediate double- K -vacancy states |
| title_short | Indirect contributions to electron-impact ionization of Li+ (1s2s S1 3) ions: Role of intermediate double- K -vacancy states |
| title_sort | indirect contributions to electron-impact ionization of li+ (1s2s s1 3) ions: role of intermediate double- k -vacancy states |
| url | http://hdl.handle.net/20.500.11937/68032 |