Plasma pressure broadening for few-electron emitters including strong electron collisions within a quantum-statistical theory
To apply spectroscopy as a diagnostic tool for dense plasmas, a theoretical approach to pressure broadening is indispensable. Here, a quantum-statistical theory is used to calculate spectral line shapes of few-electron atoms. Ionic perturbers are treated quasistatically as well as dynamically via a...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Published: |
The American Physical Society
2014
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| Online Access: | http://hdl.handle.net/20.500.11937/28847 |
| _version_ | 1848752645579210752 |
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| author | Lorenzen, S. Omar, B. Zammit, Mark Fursa, Dmitry Bray, Igor |
| author_facet | Lorenzen, S. Omar, B. Zammit, Mark Fursa, Dmitry Bray, Igor |
| author_sort | Lorenzen, S. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | To apply spectroscopy as a diagnostic tool for dense plasmas, a theoretical approach to pressure broadening is indispensable. Here, a quantum-statistical theory is used to calculate spectral line shapes of few-electron atoms. Ionic perturbers are treated quasistatically as well as dynamically via a frequency fluctuation model. Electronic perturbers are treated in the impact approximation. Strong electron-emitter collisions are consistently taken into account with an effective two-particle T-matrix approach. Convergent close-coupling calculations give scattering amplitudes including Debye screening for neutral emitters. For charged emitters, the effect of plasma screening is estimated. The electron densities considered reach up to ne=1027 m-3. Temperatures are between T=104 and 105 K. The results are compared with a dynamically screened Born approximation for Lyman lines of H and H-like Li as well as for the He 3889 Å line. For the last, a comprehensive comparison to simulations and experiments is given. For the H Lyman-a line, the width and shift are drastically reduced by the Debye screening. In the T-matrix approach, the line shape is notably changed due to the dependence on the magnetic quantum number of the emitter, whereas the difference between spin-scattering channels is negligible. |
| first_indexed | 2025-11-14T08:11:55Z |
| format | Journal Article |
| id | curtin-20.500.11937-28847 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:11:55Z |
| publishDate | 2014 |
| publisher | The American Physical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-288472017-09-13T16:07:21Z Plasma pressure broadening for few-electron emitters including strong electron collisions within a quantum-statistical theory Lorenzen, S. Omar, B. Zammit, Mark Fursa, Dmitry Bray, Igor To apply spectroscopy as a diagnostic tool for dense plasmas, a theoretical approach to pressure broadening is indispensable. Here, a quantum-statistical theory is used to calculate spectral line shapes of few-electron atoms. Ionic perturbers are treated quasistatically as well as dynamically via a frequency fluctuation model. Electronic perturbers are treated in the impact approximation. Strong electron-emitter collisions are consistently taken into account with an effective two-particle T-matrix approach. Convergent close-coupling calculations give scattering amplitudes including Debye screening for neutral emitters. For charged emitters, the effect of plasma screening is estimated. The electron densities considered reach up to ne=1027 m-3. Temperatures are between T=104 and 105 K. The results are compared with a dynamically screened Born approximation for Lyman lines of H and H-like Li as well as for the He 3889 Å line. For the last, a comprehensive comparison to simulations and experiments is given. For the H Lyman-a line, the width and shift are drastically reduced by the Debye screening. In the T-matrix approach, the line shape is notably changed due to the dependence on the magnetic quantum number of the emitter, whereas the difference between spin-scattering channels is negligible. 2014 Journal Article http://hdl.handle.net/20.500.11937/28847 10.1103/PhysRevE.89.023106 The American Physical Society restricted |
| spellingShingle | Lorenzen, S. Omar, B. Zammit, Mark Fursa, Dmitry Bray, Igor Plasma pressure broadening for few-electron emitters including strong electron collisions within a quantum-statistical theory |
| title | Plasma pressure broadening for few-electron emitters including strong electron collisions within a quantum-statistical theory |
| title_full | Plasma pressure broadening for few-electron emitters including strong electron collisions within a quantum-statistical theory |
| title_fullStr | Plasma pressure broadening for few-electron emitters including strong electron collisions within a quantum-statistical theory |
| title_full_unstemmed | Plasma pressure broadening for few-electron emitters including strong electron collisions within a quantum-statistical theory |
| title_short | Plasma pressure broadening for few-electron emitters including strong electron collisions within a quantum-statistical theory |
| title_sort | plasma pressure broadening for few-electron emitters including strong electron collisions within a quantum-statistical theory |
| url | http://hdl.handle.net/20.500.11937/28847 |