| ATOMIC AND MOLECULAR PHYSICS |
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Stark-Broadened Profiles of the Spectral Line $P_ \alpha$ in He II Ions |
| Bin Duan1**, Muhammad Abbas Bari2, Ze-Qing Wu1, Jun Yan1, Jian-Guo Wang1 |
1Institute of Applied Physics and Computational Mathematics, Beijing 100088
2Department of Physics and Applied Mathematics, Pakistan Institute of Engineering and Applied Sciences, Islamabad 45650, Pakistan
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| Cite this article: |
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Bin Duan, Muhammad Abbas Bari, Ze-Qing Wu et al 2016 Chin. Phys. Lett. 33 033201 |
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Abstract We report a systematic method to perform calculations of spectral line broadening parameters in plasmas. This method is applied to calculate Stark-broadening line profiles of $P_{\alpha}(n=4\rightarrow n=3)$ transitions under certain specific plasma conditions, by treating this case as an example. In the framework of the fully relativistic Dirac R-matrix theory, we calculate the electron-impact broadening operators, which are assumed to be diagonal matrix to simplify the situation. The electric microfield distribution function is calculated by retaining Hooper's formalism. The dipole matrix elements and atomic structure parameters used in these calculations have been obtained from atomic structure GRASP code. Based on this required data, we calculate the Stark-broadened line profiles of the Paschen spectral lines in He II ions in a systematic manner. Overall, there is a very good agreement between our calculated Stark-broadened line profiles and other line broadening numerical simulation codes (SimU and MELS). Our reported spectral line-broadening data have real applications in plasma spectroscopy, plasma diagnosis and also play a fundamental role in plasma modeling.
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Received: 10 November 2015
Published: 31 March 2016
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| PACS: |
32.70.Jz
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(Line shapes, widths, and shifts)
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52.20.Fs
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(Electron collisions)
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34.50.Fa
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(Electronic excitation and ionization of atoms (including beam-foil excitation and ionization))
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