Radiative rates and electron impact excitation rates for transitions in He II.

Kanti M. Aggarwal, Akinori Igarashi , Francis P. Keenan, Shinobu Nakazaki

Research output: Contribution to journalArticle

4 Citations (Scopus)
137 Downloads (Pure)

Abstract

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.
Original languageEnglish
Article number19
Pages (from-to)1-33
Number of pages33
JournalAtoms
Volume5
Issue number2
DOIs
Publication statusPublished - 02 May 2017

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