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EFFECTIVE COLLISION STRENGTHS FOR ELECTRON-IMPACT EXCITATION OF Ni XII

โœ Scribed by A. Matthews; C.A. Ramsbottom; K.L. Bell; F.P. Keenan

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
859 KB
Volume
70
Category
Article
ISSN
0092-640X

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โœฆ Synopsis

Effective collision strengths computed by the R-matrix method are presented for the electron-impact excitation of Cl-like Ni XII. The total wave function used in the close-coupling expansion includes the lowest 14 target states of Ni XII, arising from the 3s 2 3p 5 , 3s3p 6 and 3s 2 3p 4 3d configurations. These 14 LS target states corresponds to 31 j-resolved fine-structure levels, connected by 465 independent transitions. Effective collision strengths for all possible transitions, calculated by averaging the electron collision strengths over a Maxwellian distribution of electron velocities, are tabulated over the electron temperature range log T(K) ฯญ 5.5 to log T(K) ฯญ 6.6. This range includes the temperatures of particular interest for many astrophysical applications.

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