Electron impact excitation of n=3 and 4 states of Be
W C Fon; K A Berrington; P G Burke; V M Burke; A Hibbert; W C Fon; Dept. of Math., Malaya Univ., Kuala Lumpur, Malaysia; K A Berrington; Dept. of Math., Malaya Univ., Kuala Lumpur, Malaysia; P G Burke; Dept. of Math., Malaya Univ., Kuala Lumpur, Malaysia; V M Burke; Dept. of Math., Malaya Univ., Kuala Lumpur, Malaysia; A Hibbert; Dept. of Math., Malaya Univ., Kuala Lumpur, Malaysia
Журнал:
Journal of Physics B: Atomic, Molecular and Optical Physics
Дата:
1992-01-28
Аннотация:
The R-matrix method is used to obtain collision strengths for e<sup>-</sup>-Be scattering for transitions between the n=2, 3 and 4 levels. Three calculations are described. Firstly, a 12-state calculation is carried out with exchange including all the n=2 and 3 levels for energies from threshold to 7 Ryd. Secondly, this 12-state calculation is repeated omitting exchange. Finally, a 20-state no-exchange calculation including all n=2, 3 and 4 levels for energies from threshold to 4 Ryd is carried out. The target states in all three calculations are obtained using optimized configuration interaction expansions.
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