Breit-Pauli R-matrix calculation of fine-structure effective collision strengths for the electron impact excitation of Mg V

Claire Hudson, Catherine Ramsbottom, Patrick Norrington, Margaret Scott

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)
11 Downloads (Pure)

Abstract

Context. Electron-impact excitation collision strengths are required for the analysis and interpretation of stellar observations.
Aims. This calculation aims to provide effective collision strengths for the Mg V ion for a larger number of transitions and for a greater temperature range than previously available, using collision strength data that include contributions from resonances.
Methods. A 19-state Breit-Pauli R-matrix calculation was performed. The target states are represented by configuration interaction wavefunctions and consist of the 19 lowest LS states, having configurations 2s22p4, 2s2p5, 2p6, 2s22p33s, and 2s22p33p. These target states give rise to 37 fine-structure levels and 666 possible transitions. The effective collision strengths were calculated by averaging the electron collision strengths over a Maxwellian distribution of electron velocities.
Results. The non-zero effective collision strengths for transitions between the fine-structure levels are given for electron temperatures in the range = 3.0 - 7.0. Data for transitions among the 5 fine-structure levels arising from the 2s22p4 ground state configurations, seen in the UV range, are discussed in the paper, along with transitions in the EUV range – transitions from the ground state 3P levels to 2s2p5?3P levels. The 2s22p4?1D–2s2p5?1P transition is also noted. Data for the remaining transitions are available at the CDS.
Original languageEnglish
Pages (from-to)729-737
Number of pages9
JournalAstronomy and Astrophysics
Volume494
Issue number2
Early online date11 Dec 2008
DOIs
Publication statusPublished - 01 Feb 2009

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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