Z dependence of radiative and Auger transitions rates from doubly excited states of helium-like ions

Karim, K. R.

doi:10.1016/j.jqsrt.2009.10.011

Cited by 2 publications

(1 citation statement)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The newly developed X-ray free-electron lasers (FEL) provide a unique opportunity to investigate the behavior of inner-shell vacancy ions (Young et al 2010;Bucksbaum et al 2011;Düsterer et al 2011;Kanter et al 2011;Meyer et al 2012). The theoretical studies of the K-vacancy doubly excited levels of heliumlike ions are mostly based on non-relativistic theory or confined to some selected transitions within 2l2l and 2l3l configurations , 1978, 1980Dubau et al 1981;Safronova & Senashenko 1977;Karim & Bhalla 1986;Mosnier et al 1986;Cornille et al 1990;Deng-Hong et al 2006;Karim 2010;Kadrekar & Natarajan 2011;Natarajan & Kadrekar 2013;Natarajan 2014). The most recent and complete of these studies has been reported by Goryayev et al (2006), who presented the wavelengths and radiative transition probabilities for transitions of 2l 2l − 1s2l and 2l 3l − 1s2l, 1s3l in ions with Z = 6−36 using the Z-expansion method.…”

Section: Introductionmentioning

confidence: 99%

Energy levels and transition rates for helium-like ions withZ = 10–36

Guo

Wang

et al. 2016

A&A

View full text Add to dashboard Cite

Aims. Helium-like ions provide an important X-ray spectral diagnostics in astrophysical and high-temperature fusion plasmas. An interpretation of the observed spectra provides information on temperature, density, and chemical compositions of the plasma. Such an analysis requires information for a wide range of atomic parameters, including energy levels and transition rates. Our aim is to provide a set of accurate energy levels and transition rates for helium-like ions with Z = 10-36. Methods. The second-order many-body perturbation theory (MBPT) was adopted in this paper. To support our MBPT results, we performed an independent calculation using the multiconfiguration Dirac-Hartree-Fock (MCDHF) method. Results. We provide accurate energies for the lowest singly excited 70 levels among 1snl (n ≤ 6, l ≤ (n − 1)) configurations and the lowest doubly excited 250 levels arising from the K-vacancy 2ln l (n ≤ 6, l ≤ (n − 1)) configurations of helium-like ions with Z = 10−36. Wavelengths, transition rates, oscillator strengths, and line strengths are calculated for the E1, M1, E2, and M2 transitions among these levels. The radiative lifetimes are reported for all the calculated levels. Conclusions. Our MBPT results for singly excited n ≤ 2 levels show excellent agreement with other elaborate calculations, while those for singly excited n ≥ 3 and doubly excited levels show significant improvements over previous theoretical results. Our results will be very helpful for astrophysical line identification and plasma diagnostics.

show abstract