Energy levels, radiative rates and electron impact excitation rates for transitions in He-like Kr XXXV

Abstract

We report calculations of energy levels, radiative rates and electron impact excitation cross sections and rates for transitions in He-like Kr XXXV. 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) is used. Oscillator strengths, radiative rates and line strengths are reported for all E1, E2, M1, and M2 transitions among the lowest 49 levels. Additionally, theoretical lifetimes are listed for all 49 levels. Collision strengths are averaged over a Maxwellian velocity distribution and the effective collision strengths obtained listed over a wide temperature range up to 10**8.1 K. Comparisons are made with similar data obtained with the Flexible Atomic Code (FAC) to assess the accuracy of the results and to highlight the importance of resonances, included in calculations with DARC, in the determination of effective collision strengths. Differences between the collision strengths from DARC and FAC, particularly for forbidden transitions, are also discussed. Finally, discrepancies between the present results of effective collision strengths from the {\sc darc} code and earlier semi-relativistic $R$-matrix data are noted over a wide range of electron temperatures for many transitions of Kr XXXV.

12p Text, 6 Tables, 11 Figures, will appear in Physica Scripta. arXiv admin note: substantial text overlap with arXiv:1207.5423

References in corpus (3)

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• Electron impact excitation of Helium-like ions up to n=4 levels including radiation damping
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