Ion-atom excitation at high and intermediate energies
Exact post and prior impulse approximation cross sections are calculated for the excitation process H++H (1s to n=2). The results show a large post-prior discrepancy and a huge disagreement with the experiments, even at energies where the simple Born approximation already works. Following a previous...
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1990
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09534075_v23_n20_p3629_Rodriguez http://hdl.handle.net/20.500.12110/paper_09534075_v23_n20_p3629_Rodriguez |
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paper:paper_09534075_v23_n20_p3629_Rodriguez2023-06-08T15:55:07Z Ion-atom excitation at high and intermediate energies Cross section Eikonal Excitation cross section Excitation process High energy Impulse approximation Intermediate energies Ion-atom Projectile charge Born approximation Experiments Exact post and prior impulse approximation cross sections are calculated for the excitation process H++H (1s to n=2). The results show a large post-prior discrepancy and a huge disagreement with the experiments, even at energies where the simple Born approximation already works. Following a previous work along this line, the authors show that the theory remarkably improves when the correct asymptotic conditions are observed by including eikonal phases. This new approximation, called the eikonal impulse approximation, presents a negligible prior-post discrepancy at high energies and the prior version produces very good agreement with the experiments. Departure of the total excitation cross section from the quadratic law on the projectile charge (saturation) is discussed and compared with the available data. Scaling laws, alignment factors and s-p coherences are reported and compared with previous results. © 1990, IOP Publishing Ltd. 1990 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09534075_v23_n20_p3629_Rodriguez http://hdl.handle.net/20.500.12110/paper_09534075_v23_n20_p3629_Rodriguez |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Cross section Eikonal Excitation cross section Excitation process High energy Impulse approximation Intermediate energies Ion-atom Projectile charge Born approximation Experiments |
| spellingShingle |
Cross section Eikonal Excitation cross section Excitation process High energy Impulse approximation Intermediate energies Ion-atom Projectile charge Born approximation Experiments Ion-atom excitation at high and intermediate energies |
| topic_facet |
Cross section Eikonal Excitation cross section Excitation process High energy Impulse approximation Intermediate energies Ion-atom Projectile charge Born approximation Experiments |
| description |
Exact post and prior impulse approximation cross sections are calculated for the excitation process H++H (1s to n=2). The results show a large post-prior discrepancy and a huge disagreement with the experiments, even at energies where the simple Born approximation already works. Following a previous work along this line, the authors show that the theory remarkably improves when the correct asymptotic conditions are observed by including eikonal phases. This new approximation, called the eikonal impulse approximation, presents a negligible prior-post discrepancy at high energies and the prior version produces very good agreement with the experiments. Departure of the total excitation cross section from the quadratic law on the projectile charge (saturation) is discussed and compared with the available data. Scaling laws, alignment factors and s-p coherences are reported and compared with previous results. © 1990, IOP Publishing Ltd. |
| title |
Ion-atom excitation at high and intermediate energies |
| title_short |
Ion-atom excitation at high and intermediate energies |
| title_full |
Ion-atom excitation at high and intermediate energies |
| title_fullStr |
Ion-atom excitation at high and intermediate energies |
| title_full_unstemmed |
Ion-atom excitation at high and intermediate energies |
| title_sort |
ion-atom excitation at high and intermediate energies |
| publishDate |
1990 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09534075_v23_n20_p3629_Rodriguez http://hdl.handle.net/20.500.12110/paper_09534075_v23_n20_p3629_Rodriguez |
| _version_ |
1768542276389175296 |