Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...489.1377a&link_type=abstract
Astronomy and Astrophysics, Volume 489, Issue 3, 2008, pp.1377-1388
Astronomy and Astrophysics
Astrophysics
7
Atomic Data, Atomic Processes
Scientific paper
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.
Tables 2 and 6 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/489/1377
Aggarwal Kanti M.
Keenan Francis P.
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