Energy levels, radiative rates and electron impact excitation rates for transitions in He-like Li II, Be III, B IV and C V

K. M. Aggarwal, T. Kato, F. P. Keenan, I. Murakami

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We report calculations for energy levels, radiative rates and electron impact excitation rates for transitions in He-like Li II, Be III, B IV and C V. 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) is used. Oscillator strengths, radiative rates and line strengths are reported for all E1, E2, M1 and M2 transitions among the lowest 49 levels of each ion. Collision strengths have been averaged over a Maxwellian velocity distribution and the effective collision strengths so obtained are reported over a wide temperature range up to 10(6) K. Comparisons have been made with similar data obtained from the flexible atomic code (FAC) to highlight the importance of resonances, included in calculations from darc, in the determination of effective collision strengths. Discrepancies between the collision strengths from darc and fac, particularly for weak transitions and at low energies, have also been discussed. Additionally, lifetimes are also listed for all calculated levels of the above four ions.
Original languageEnglish
Article number015302
Pages (from-to)1-18
Number of pages18
JournalPhysica Scripta
Volume83
Early online date13 Dec 2010
DOIs
Publication statusPublished - Jan 2011

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Mathematical Physics

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