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Radiative Rates and Electron Impact Excitation Rates for Transitions in He II

1
Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University Belfast, Belfast BT7 1NN, Northern Ireland, UK
2
Department of Applied Physics, Faculty of Engineering, University of Miyazaki, Miyazaki 889-2192, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: James F. Babb
Atoms 2017, 5(2), 19; https://doi.org/10.3390/atoms5020019
Received: 26 January 2017 / Revised: 20 April 2017 / Accepted: 20 April 2017 / Published: 2 May 2017
(This article belongs to the Section Atomic, Molecular and Nuclear Spectroscopy and Collisions)
We report calculations of energy levels, radiative rates, collision strengths and effective collision strengths for transitions among the lowest 25 levels of the n 5 configurations of He II. The general-purpose relativistic atomic structure package (grasp) and Dirac atomic R-matrix code (darc) are adopted for the calculations. Radiative rates, oscillator strengths and line strengths are reported for all electric dipole (E1), magnetic dipole (M1), electric quadrupole (E2) and magnetic quadrupole (M2) transitions among the 25 levels. Furthermore, collision strengths and effective collision strengths are listed for all 300 transitions among the above 25 levels over a wide energy (temperature) range up to 9 Ryd (10 5.4 K). Comparisons are made with earlier available results, and the accuracy of the data is assessed. View Full-Text
Keywords: H-like helium; radiative rates; collision strengths; effective collision strengths H-like helium; radiative rates; collision strengths; effective collision strengths
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Aggarwal, K.M.; Igarashi, A.; Keenan, F.P.; Nakazaki, S. Radiative Rates and Electron Impact Excitation Rates for Transitions in He II. Atoms 2017, 5, 19.

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