Electron-impact excitation of W44+ and W45

Plans to employ tungsten in the divertor region of the International Thermonuclear Experimental Reactor require radiative and collisional data for modelling x-ray emissions of highly ionized stages of tungsten. In an earlier paper, we reported on the results of fully relativistic R-matrix calculatio...

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Bibliographic Details
Published in:Journal of physics. B, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2007-01, Vol.40 (2), p.247-258
Main Authors: Ballance, C P, Griffin, D C
Format: Article
Language:English
Subjects:
Atomic and molecular collision processes and interactions
Atomic and molecular physics
Electron scattering
Electron-ion scattering
excitation and ionization
Exact sciences and technology
Physics
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Summary:Plans to employ tungsten in the divertor region of the International Thermonuclear Experimental Reactor require radiative and collisional data for modelling x-ray emissions of highly ionized stages of tungsten. In an earlier paper, we reported on the results of fully relativistic R-matrix calculations for W46+ that included the effects of radiation damping on the resonance contributions. In this paper, we present the results of similar fully relativistic, radiatively damped R-matrix calculations for W44+ and W45+. Radiation damping is found to be small for W45+, but is appreciable for many of the excitations from the ground and metastable levels of W44+. Rates from the present calculations will be combined with those from the calculations for W46+ and employed for collisional-radiative modelling for these ions.
ISSN:0953-4075
1361-6455
DOI:10.1088/0953-4075/40/2/001