The fully relativistic implementation of the convergent close-coupling method
The calculation of accurate excitation and ionization cross sections for electron collisions with atoms and ions plays a fundamental role in atomic and molecular physics, laser physics, x-ray spectroscopy, plasma physics and chemistry. Within the veil of plasma physics lie important research areas a...
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| Format: | Journal Article |
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Institute of Physics Publishing Ltd.
2011
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| Online Access: | http://hdl.handle.net/20.500.11937/49503 |
| _version_ | 1848758253638385664 |
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| author | Bostock, Christopher |
| author_facet | Bostock, Christopher |
| author_sort | Bostock, Christopher |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The calculation of accurate excitation and ionization cross sections for electron collisions with atoms and ions plays a fundamental role in atomic and molecular physics, laser physics, x-ray spectroscopy, plasma physics and chemistry. Within the veil of plasma physics lie important research areas affiliated with the lighting industry, nuclear fusion and astrophysics. For high energy projectiles or targets with a large atomic number it is presently understood that a scattering formalism based on the Dirac equation is required to incorporate relativistic effects. This tutorial outlines the development of the relativistic convergent close-coupling (RCCC) method and highlights the following three main accomplishments. (i) The inclusion of the Breit interaction, a relativistic correction to the Coulomb potential, in the RCCC method. This led to calculations that resolved a discrepancy between theory and experiment for the polarization of x-rays emitted by highly charged hydrogen-like ions excited by electron impact (Bostock et al 2009 Phys. Rev. A 80 052708). (ii) The extension of the RCCC method to accommodate two-electron and quasi-two-electron targets. The method was applied toelectron scattering from mercury. Accurate plasma physics modelling of mercury-based fluorescent lamps requires detailed information on a large number of electron impact excitation cross sections involving transitions between various states (Bostock et al 2010 Phys. Rev. A 82 022713). (iii) The third accomplishment outlined in this tutorial is the restructuring of the RCCC computer code to utilize a hybrid OpenMP–MPI parallelization scheme which now enables the RCCC code to run on the latest high performance supercomputer architectures. |
| first_indexed | 2025-11-14T09:41:03Z |
| format | Journal Article |
| id | curtin-20.500.11937-49503 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:41:03Z |
| publishDate | 2011 |
| publisher | Institute of Physics Publishing Ltd. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-495032018-05-04T01:38:21Z The fully relativistic implementation of the convergent close-coupling method Bostock, Christopher N/A The calculation of accurate excitation and ionization cross sections for electron collisions with atoms and ions plays a fundamental role in atomic and molecular physics, laser physics, x-ray spectroscopy, plasma physics and chemistry. Within the veil of plasma physics lie important research areas affiliated with the lighting industry, nuclear fusion and astrophysics. For high energy projectiles or targets with a large atomic number it is presently understood that a scattering formalism based on the Dirac equation is required to incorporate relativistic effects. This tutorial outlines the development of the relativistic convergent close-coupling (RCCC) method and highlights the following three main accomplishments. (i) The inclusion of the Breit interaction, a relativistic correction to the Coulomb potential, in the RCCC method. This led to calculations that resolved a discrepancy between theory and experiment for the polarization of x-rays emitted by highly charged hydrogen-like ions excited by electron impact (Bostock et al 2009 Phys. Rev. A 80 052708). (ii) The extension of the RCCC method to accommodate two-electron and quasi-two-electron targets. The method was applied toelectron scattering from mercury. Accurate plasma physics modelling of mercury-based fluorescent lamps requires detailed information on a large number of electron impact excitation cross sections involving transitions between various states (Bostock et al 2010 Phys. Rev. A 82 022713). (iii) The third accomplishment outlined in this tutorial is the restructuring of the RCCC computer code to utilize a hybrid OpenMP–MPI parallelization scheme which now enables the RCCC code to run on the latest high performance supercomputer architectures. 2011 Journal Article http://hdl.handle.net/20.500.11937/49503 10.1088/0953-4075/44/8/083001 Institute of Physics Publishing Ltd. restricted |
| spellingShingle | N/A Bostock, Christopher The fully relativistic implementation of the convergent close-coupling method |
| title | The fully relativistic implementation of the convergent close-coupling method |
| title_full | The fully relativistic implementation of the convergent close-coupling method |
| title_fullStr | The fully relativistic implementation of the convergent close-coupling method |
| title_full_unstemmed | The fully relativistic implementation of the convergent close-coupling method |
| title_short | The fully relativistic implementation of the convergent close-coupling method |
| title_sort | fully relativistic implementation of the convergent close-coupling method |
| topic | N/A |
| url | http://hdl.handle.net/20.500.11937/49503 |