Differential electron scattering from positive ions measured by zero-degree ion-atom spectroscopy
Recent developments in quasi-free electron scattering from highly charged ions are reported. Results using a high-efficiency zero-degree Auger projectile spectroscopy setup are presented primarily for collisions of H- and He-like boron beams with H2 targets. A novel technique for the in situ control...
Guardado en:
| Autores principales: | , , , , , , , , |
|---|---|
| Formato: | JOUR |
| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_0168583X_v205_n_p508_Zouros |
| Aporte de: |
| id |
todo:paper_0168583X_v205_n_p508_Zouros |
|---|---|
| record_format |
dspace |
| spelling |
todo:paper_0168583X_v205_n_p508_Zouros2023-10-03T15:06:25Z Differential electron scattering from positive ions measured by zero-degree ion-atom spectroscopy Zouros, T.J.M. Benis, E.P. Gorczyca, T.W. González, A.D. Zamkov, M. Richard, P. Cassimi A Gervais B Vernhet D Electron-ion scattering HCI He-like ions Highly charged ions Quasi-free electron scattering R-matrix calculation Resonant excitation Zero-degree Auger projectile spectroscopy Atomic physics Ground state High energy physics Matrix algebra Positive ions Spectroscopy Isoelectronic sequences Electron scattering Recent developments in quasi-free electron scattering from highly charged ions are reported. Results using a high-efficiency zero-degree Auger projectile spectroscopy setup are presented primarily for collisions of H- and He-like boron beams with H2 targets. A novel technique for the in situ control and determination of the metastable 1s 2s3S beam fraction of He-like boron allowed for an accurate determination of absolute double differential scattering cross sections for 180 ° resonant and non-resonant electron scattering from both ground-(1s2) and mixed-(1s2, 1s 2s 3S) B3+ states. The observed richly structured B2+ (1s 2l nl′) Rydberg series is produced by resonant excitation (RE) from the 1s2 ground state, while the triply excited B2+ (2s 2l′ 2l″) hollow ionic states are produced by RE from the 1s 2s3S metastable state. The consistency of the method was checked by quasi-free electron scattering from H-like B4+ ions giving rise to the 2l nl′ Rydberg series. Differential R-matrix calculations within the electron scattering model for electron-ion scattering from both H-like and ground state He-like boron were found to be in excellent overall agreement. The production of triply excited (2s 2l′ 2l″) states by RE was also studied for the Z = 5-9 isoelectronic sequence. These results convincingly demonstrate that large-angle differential scattering cross section measurements, practically impossible to perform with present day crossed or merged electron-ion beam techniques, are amenable to measurement through high resolution electron spectroscopy of ion-atom collisions, providing some of the most sensitive tests of atomic structure and electron-ion scattering calculations. © 2003 Elsevier Science B.V. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0168583X_v205_n_p508_Zouros |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Electron-ion scattering HCI He-like ions Highly charged ions Quasi-free electron scattering R-matrix calculation Resonant excitation Zero-degree Auger projectile spectroscopy Atomic physics Ground state High energy physics Matrix algebra Positive ions Spectroscopy Isoelectronic sequences Electron scattering |
| spellingShingle |
Electron-ion scattering HCI He-like ions Highly charged ions Quasi-free electron scattering R-matrix calculation Resonant excitation Zero-degree Auger projectile spectroscopy Atomic physics Ground state High energy physics Matrix algebra Positive ions Spectroscopy Isoelectronic sequences Electron scattering Zouros, T.J.M. Benis, E.P. Gorczyca, T.W. González, A.D. Zamkov, M. Richard, P. Cassimi A Gervais B Vernhet D Differential electron scattering from positive ions measured by zero-degree ion-atom spectroscopy |
| topic_facet |
Electron-ion scattering HCI He-like ions Highly charged ions Quasi-free electron scattering R-matrix calculation Resonant excitation Zero-degree Auger projectile spectroscopy Atomic physics Ground state High energy physics Matrix algebra Positive ions Spectroscopy Isoelectronic sequences Electron scattering |
| description |
Recent developments in quasi-free electron scattering from highly charged ions are reported. Results using a high-efficiency zero-degree Auger projectile spectroscopy setup are presented primarily for collisions of H- and He-like boron beams with H2 targets. A novel technique for the in situ control and determination of the metastable 1s 2s3S beam fraction of He-like boron allowed for an accurate determination of absolute double differential scattering cross sections for 180 ° resonant and non-resonant electron scattering from both ground-(1s2) and mixed-(1s2, 1s 2s 3S) B3+ states. The observed richly structured B2+ (1s 2l nl′) Rydberg series is produced by resonant excitation (RE) from the 1s2 ground state, while the triply excited B2+ (2s 2l′ 2l″) hollow ionic states are produced by RE from the 1s 2s3S metastable state. The consistency of the method was checked by quasi-free electron scattering from H-like B4+ ions giving rise to the 2l nl′ Rydberg series. Differential R-matrix calculations within the electron scattering model for electron-ion scattering from both H-like and ground state He-like boron were found to be in excellent overall agreement. The production of triply excited (2s 2l′ 2l″) states by RE was also studied for the Z = 5-9 isoelectronic sequence. These results convincingly demonstrate that large-angle differential scattering cross section measurements, practically impossible to perform with present day crossed or merged electron-ion beam techniques, are amenable to measurement through high resolution electron spectroscopy of ion-atom collisions, providing some of the most sensitive tests of atomic structure and electron-ion scattering calculations. © 2003 Elsevier Science B.V. All rights reserved. |
| format |
JOUR |
| author |
Zouros, T.J.M. Benis, E.P. Gorczyca, T.W. González, A.D. Zamkov, M. Richard, P. Cassimi A Gervais B Vernhet D |
| author_facet |
Zouros, T.J.M. Benis, E.P. Gorczyca, T.W. González, A.D. Zamkov, M. Richard, P. Cassimi A Gervais B Vernhet D |
| author_sort |
Zouros, T.J.M. |
| title |
Differential electron scattering from positive ions measured by zero-degree ion-atom spectroscopy |
| title_short |
Differential electron scattering from positive ions measured by zero-degree ion-atom spectroscopy |
| title_full |
Differential electron scattering from positive ions measured by zero-degree ion-atom spectroscopy |
| title_fullStr |
Differential electron scattering from positive ions measured by zero-degree ion-atom spectroscopy |
| title_full_unstemmed |
Differential electron scattering from positive ions measured by zero-degree ion-atom spectroscopy |
| title_sort |
differential electron scattering from positive ions measured by zero-degree ion-atom spectroscopy |
| url |
http://hdl.handle.net/20.500.12110/paper_0168583X_v205_n_p508_Zouros |
| work_keys_str_mv |
AT zourostjm differentialelectronscatteringfrompositiveionsmeasuredbyzerodegreeionatomspectroscopy AT benisep differentialelectronscatteringfrompositiveionsmeasuredbyzerodegreeionatomspectroscopy AT gorczycatw differentialelectronscatteringfrompositiveionsmeasuredbyzerodegreeionatomspectroscopy AT gonzalezad differentialelectronscatteringfrompositiveionsmeasuredbyzerodegreeionatomspectroscopy AT zamkovm differentialelectronscatteringfrompositiveionsmeasuredbyzerodegreeionatomspectroscopy AT richardp differentialelectronscatteringfrompositiveionsmeasuredbyzerodegreeionatomspectroscopy AT cassimia differentialelectronscatteringfrompositiveionsmeasuredbyzerodegreeionatomspectroscopy AT gervaisb differentialelectronscatteringfrompositiveionsmeasuredbyzerodegreeionatomspectroscopy AT vernhetd differentialelectronscatteringfrompositiveionsmeasuredbyzerodegreeionatomspectroscopy |
| _version_ |
1807323823310110720 |