Effective Collision Strengths for Fine-Structure Transitions from the 3s 23p 5 2P Ground State of Chlorine-like NI XII

Details Effective Collision Strengths for Fine-Structure Transitions from the 3s 23p 5 2P Ground State of Chlorine-like NI XII Effective Collision Strengths for Fine-Structure Transitions from the 3s 23p 5 2P Ground State of Chlorine-like NI XII

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...492..415m&link_type=abstract

Astrophysical Journal v.492, p.415

Astronomy and Astrophysics

Astronomy

2

Atomic Data, Atomic Processes

Scientific paper

The R-matrix method is used to compute electron impact collision strengths for transitions in Ni XII from its ground-state fine-structure levels. Sophisticated configuration-interaction wave functions are used to represent the 14 lowest LS target states employed in the R-matrix expansion. By transforming the LS-coupled reactance matrices, and by assuming a Maxwellian velocity distribution for the incident electrons, the effective collision strengths are calculated for the 3s23p5 2Po_{1/2}-3s23p5 2Po_{3/2} transition within the ground state and from both these fine-structure levels to the 29 excited levels arising from states obtained from 3s3p6 and 3s23p43d configurations. Effective collision strengths, obtained in the temperature range log Te = 3.2-6.6 (K), are expected to have an accuracy of better than 20%.

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