Energy levels, radiative rates, and electron impact excitation rates for transitions in OVII

K. M. Aggarwal, F. P. Keenan

Research output: Contribution to journalArticle

14 Citations (Scopus)
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Abstract

Aims.
In this paper we report calculations for energy levels, radiative rates, and electron impact excitation rates for transitions in O vii.
Methods.
The grasp (general-purpose relativistic atomic structure package) is adopted for calculating energy levels and radiative
rates. For determining the collision strengths and subsequently the excitation rates, the Dirac atomic R-matrix code (darc) and the
flexible atomic code (fac) are used.
Results.
Oscillator strengths, radiative rates, and line strengths are reported for all E1, E2, M1, and M2 transitions among the lowest
49 levels of O vii. Collision strengths have been averaged over a Maxwellian velocity distribution, and the resulting effective collision
strengths are reported over a wide temperature range below 2 × 106 K. Additionally, lifetimes are also listed for all levels.
Key words.
Original languageEnglish
Pages (from-to)1377-1388
JournalAstronomy and Astrophysics
Volume489
DOIs
Publication statusPublished - Oct 2008

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

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