Resonance-excitation process for Ni-like tantalum

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T. M. Shen,^1,2 C. Y. Chen,^1,2 Y. S. Wang,^1,2 and Y. M. Zou^1,2
¹Shanghai EBIT Lab, Modern Physics Institute, Fudan University, Shanghai 200433, China
²The Key Lab of Applied Ion Beam Physics, The Ministry of Education, Fudan University, Shanghai 200433, China

M. F. Gu
Department of Physics, Stanford University, Stanford, California 94305, USA

Received 14 February 2007; published 6 August 2007

Adetailed large-scale calculation on the resonant excitation rate coefficients fromthe ground state to the 106 fine-structure levels belonging to3l¹⁷4l (l=0,1,2; l=0,1,2,3) configurations of Ni-like tantalum have been performedusing the relativistic distorted-wave approximation. The contributions through all possibleCu-like doubly excited states 3l¹⁷4lnl and 3l¹⁷5lnl (n15, l8) arecalculated. The validity of n⁻³ scaling law is investigated. Theradiative damping effects on resonant excitation rates are studied. Thesignificant effects arising from decays to autoionizing levels are alsoinvestigated. The contributions from resonant excitation are found to beas important as direct excitation processes for most transitions. Insome cases, the resonant excitation can enhance the excitation ratecoefficients by an order of magnitude. Large discrepancies between thepresent resonant excitation rate coefficients with previously published values arefound, and the present results should be more reliable andaccurate.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.76.022703
DOI:	10.1103/PhysRevA.76.022703
PACS:	34.80.Dp; 34.80.Kw; 34.80.Lx 34.80.Dp Atomic excitation and ionization by electron impact 34.80.Kw Electron–ion scattering; excitation and ionization 34.80.Lx Electron–ion recombination and electron attachment YEAR: 2007
KEYWORDS:	autoionisation, electron impact excitation, fine structure, resonant states, tantalum

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