Volume 555, July 2013
|Number of page(s)||9|
|Section||Atomic, molecular, and nuclear data|
|Published online||17 July 2013|
Electron-impact broadening parameters for Be II, Sr II, and Ba II spectral lines
Data Center for High Energy Density Physics, Institute of Applied Physics
and Computational Mathematics,
2 National Astronomical Observatories, Chinese Academy of Sciences, 100012 Beijing, PR China
3 Pakistan Atomic Energy Commission, PO Box 1114, 44000 Islamabad, Pakistan
4 HEDPS, Center for Applied Physics and Technology, Peking University, 100871 Beijing, PR China
Accepted: 8 May 2013
Aims. We present results of the electron-impact broadening parameters (i.e., widths and shifts) of spectral lines in singly ionized Be II, Sr II, and Ba II ions, calculated by using our relativistic quantum mechanical methods.
Methods. In these calculations, Dirac R-matrix methods were used to solve (N + 1)- electron colliding systems to obtain the required scattering matrices. The dimensionless collision strength Ω(ε) is calculated as a function of incident electron energies ε.
Results. The present line-broadening parameters are required for future spectral analysis by means of state-of-the-art nonlocal thermodynamic equilibrium atmospheres, which is now hampered largely by the paucity of reliable atomic and accurate line-broadening data tables. Our results for the spectral line-broadening parameters in the case of three ions obtained for a set of electron temperatures at an electron density 1017 cm-3 show very good agreement with other theoretical calculations, and are much closer to the available experimental measurements.
Key words: line: profiles / atomic processes / atomic data
© ESO, 2013
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