Adiabatic-nuclei calculations of positron scattering from molecular hydrogen
The single-center adiabatic-nuclei convergent close-coupling method is used to investigate positron collisions with molecular hydrogen (H2) in the ground and first vibrationally excited states. Cross sections are presented over the energy range from 1 to 1000 eV for elastic scattering, vibrational e...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Published: |
American Physical Society
2017
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| Online Access: | http://hdl.handle.net/20.500.11937/50221 |
| _version_ | 1848758424745017344 |
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| author | Zammit, M. Fursa, Dmitry Savage, J. Bray, Igor Chiari, L. Zecca, A. Brunger, M. |
| author_facet | Zammit, M. Fursa, Dmitry Savage, J. Bray, Igor Chiari, L. Zecca, A. Brunger, M. |
| author_sort | Zammit, M. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The single-center adiabatic-nuclei convergent close-coupling method is used to investigate positron collisions with molecular hydrogen (H2) in the ground and first vibrationally excited states. Cross sections are presented over the energy range from 1 to 1000 eV for elastic scattering, vibrational excitation, total ionization, and the grand total cross section. The present adiabatic-nuclei positron-H2 scattering length is calculated as A=−2.70a0 for the ground state and A=−3.16a0 for the first vibrationally excited state. The present elastic differential cross sections are also used to “correct” the low-energy grand total cross-section measurements of the Trento group [A. Zecca et al., Phys. Rev. A 80, 032702 (2009)] for the forward-angle-scattering effect. In general, the comparison with experiment is good. By performing convergence studies, we estimate that our Rm=1.448a0 fixed-nuclei results are converged to within ±5% for the major scattering integrated cross sections. |
| first_indexed | 2025-11-14T09:43:46Z |
| format | Journal Article |
| id | curtin-20.500.11937-50221 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:43:46Z |
| publishDate | 2017 |
| publisher | American Physical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-502212017-09-13T15:48:11Z Adiabatic-nuclei calculations of positron scattering from molecular hydrogen Zammit, M. Fursa, Dmitry Savage, J. Bray, Igor Chiari, L. Zecca, A. Brunger, M. The single-center adiabatic-nuclei convergent close-coupling method is used to investigate positron collisions with molecular hydrogen (H2) in the ground and first vibrationally excited states. Cross sections are presented over the energy range from 1 to 1000 eV for elastic scattering, vibrational excitation, total ionization, and the grand total cross section. The present adiabatic-nuclei positron-H2 scattering length is calculated as A=−2.70a0 for the ground state and A=−3.16a0 for the first vibrationally excited state. The present elastic differential cross sections are also used to “correct” the low-energy grand total cross-section measurements of the Trento group [A. Zecca et al., Phys. Rev. A 80, 032702 (2009)] for the forward-angle-scattering effect. In general, the comparison with experiment is good. By performing convergence studies, we estimate that our Rm=1.448a0 fixed-nuclei results are converged to within ±5% for the major scattering integrated cross sections. 2017 Journal Article http://hdl.handle.net/20.500.11937/50221 10.1103/PhysRevA.95.022707 American Physical Society restricted |
| spellingShingle | Zammit, M. Fursa, Dmitry Savage, J. Bray, Igor Chiari, L. Zecca, A. Brunger, M. Adiabatic-nuclei calculations of positron scattering from molecular hydrogen |
| title | Adiabatic-nuclei calculations of positron scattering from molecular hydrogen |
| title_full | Adiabatic-nuclei calculations of positron scattering from molecular hydrogen |
| title_fullStr | Adiabatic-nuclei calculations of positron scattering from molecular hydrogen |
| title_full_unstemmed | Adiabatic-nuclei calculations of positron scattering from molecular hydrogen |
| title_short | Adiabatic-nuclei calculations of positron scattering from molecular hydrogen |
| title_sort | adiabatic-nuclei calculations of positron scattering from molecular hydrogen |
| url | http://hdl.handle.net/20.500.11937/50221 |