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...
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2003
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0168583X_v205_n_p508_Zouros http://hdl.handle.net/20.500.12110/paper_0168583X_v205_n_p508_Zouros |
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paper:paper_0168583X_v205_n_p508_Zouros2023-06-08T15:17:47Z Differential electron scattering from positive ions measured by zero-degree ion-atom spectroscopy 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. 2003 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0168583X_v205_n_p508_Zouros 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 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. |
| 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 |
| publishDate |
2003 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0168583X_v205_n_p508_Zouros http://hdl.handle.net/20.500.12110/paper_0168583X_v205_n_p508_Zouros |
| _version_ |
1768542833990434816 |