Collisions of Electrons with Alkali, Alkaline and Complex Atoms Relevant to Solar and Stellar Atmospheres
In solar and stellar atmospheres, atomic excitation by impact with electrons plays an important role in the formation of spectral lines. We make use of available experimental and theoretical cross-sections to calculate the excitation rates in <i>s</i>–<i>p</i> transitions of...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-11-01
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| Series: | Universe |
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| Online Access: | https://www.mdpi.com/2218-1997/8/12/613 |
| _version_ | 1797455050572824576 |
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| author | Moncef Derouich Saleh Qutub Fainana Mustajab Badruddin Zaheer Ahmad |
| author_facet | Moncef Derouich Saleh Qutub Fainana Mustajab Badruddin Zaheer Ahmad |
| author_sort | Moncef Derouich |
| collection | DOAJ |
| description | In solar and stellar atmospheres, atomic excitation by impact with electrons plays an important role in the formation of spectral lines. We make use of available experimental and theoretical cross-sections to calculate the excitation rates in <i>s</i>–<i>p</i> transitions of alkali and alkaline atoms through collisions with electrons. Then, we infer a general formula for calculating the excitation rates by using genetic programming numerical methods. We propose an extension of our approach to deduce collisional excitation rates for complex atoms and atoms with hyperfine structure. Furthermore, the developed method is also applied to determine collisional polarization transfer rates. Our results are not specific to a given atom and can be applied to any <i>s</i>–<i>p</i> atomic transition. The accuracy of our results is discussed. |
| first_indexed | 2024-03-09T15:46:55Z |
| format | Article |
| id | doaj.art-a9b767fa4f3445b2ad23e8c00a0fa43b |
| institution | Directory Open Access Journal |
| issn | 2218-1997 |
| language | English |
| last_indexed | 2024-03-09T15:46:55Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Universe |
| spelling | doaj.art-a9b767fa4f3445b2ad23e8c00a0fa43b2023-11-24T18:28:51ZengMDPI AGUniverse2218-19972022-11-0181261310.3390/universe8120613Collisions of Electrons with Alkali, Alkaline and Complex Atoms Relevant to Solar and Stellar AtmospheresMoncef Derouich0Saleh Qutub1Fainana Mustajab2Badruddin Zaheer Ahmad3Astronomy and Space Science Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi ArabiaAstronomy and Space Science Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi ArabiaPhysics Deparment, University Polytechnic, Jamia Millia Islamia, New Delhi 110025, IndiaAstronomy and Space Science Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi ArabiaIn solar and stellar atmospheres, atomic excitation by impact with electrons plays an important role in the formation of spectral lines. We make use of available experimental and theoretical cross-sections to calculate the excitation rates in <i>s</i>–<i>p</i> transitions of alkali and alkaline atoms through collisions with electrons. Then, we infer a general formula for calculating the excitation rates by using genetic programming numerical methods. We propose an extension of our approach to deduce collisional excitation rates for complex atoms and atoms with hyperfine structure. Furthermore, the developed method is also applied to determine collisional polarization transfer rates. Our results are not specific to a given atom and can be applied to any <i>s</i>–<i>p</i> atomic transition. The accuracy of our results is discussed.https://www.mdpi.com/2218-1997/8/12/613collisionssolar energySun: atmospherestars: atmospheresatomic datalight formation |
| spellingShingle | Moncef Derouich Saleh Qutub Fainana Mustajab Badruddin Zaheer Ahmad Collisions of Electrons with Alkali, Alkaline and Complex Atoms Relevant to Solar and Stellar Atmospheres Universe collisions solar energy Sun: atmosphere stars: atmospheres atomic data light formation |
| title | Collisions of Electrons with Alkali, Alkaline and Complex Atoms Relevant to Solar and Stellar Atmospheres |
| title_full | Collisions of Electrons with Alkali, Alkaline and Complex Atoms Relevant to Solar and Stellar Atmospheres |
| title_fullStr | Collisions of Electrons with Alkali, Alkaline and Complex Atoms Relevant to Solar and Stellar Atmospheres |
| title_full_unstemmed | Collisions of Electrons with Alkali, Alkaline and Complex Atoms Relevant to Solar and Stellar Atmospheres |
| title_short | Collisions of Electrons with Alkali, Alkaline and Complex Atoms Relevant to Solar and Stellar Atmospheres |
| title_sort | collisions of electrons with alkali alkaline and complex atoms relevant to solar and stellar atmospheres |
| topic | collisions solar energy Sun: atmosphere stars: atmospheres atomic data light formation |
| url | https://www.mdpi.com/2218-1997/8/12/613 |
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