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EFFECTIVE COLLISION STRENGTHS FOR ELECTRON IMPACT EXCITATION OF Cl III

โœ Scribed by C.A. RAMSBOTTOM; K.L. BELL; F.P. KEENAN

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
244 KB
Volume
77
Category
Article
ISSN
0092-640X

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โœฆ Synopsis

Effective collision strengths for electron-impact excitation of the phosphorus-like ion Cl III are presented for all fine-structure transitions among the levels arising from the lowest 23 LS states. The collisional cross sections are computed in the multichannel close-coupling R-matrix approximation, where sophisticated configurationinteraction wave functions are used to represent the target states. The 23 LS states are formed from the basis configurations 3s 2 3 p 3 , 3s3 p 4 , 3s 2 3 p 2 3d, and 3s 2 3 p 2 4s, and correspond to 49 fine-structure levels, leading to a total possible 1176 fine-structure transitions. The effective collision strengths, obtained by averaging the electron collision strengths over a Maxwellian distribution of electron velocities, are tabulated in this paper for all 1176 transitions and for electron temperatures in the ranges T (K) = 7500-25,000 and log T (K) = 4.4-5.4. The former range encompasses the temperatures of particular importance for application to gaseous nebulae, while the latter range is more applicable to the study of solar and laboratory-type plasmas.

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