Electron excitation cross sections for multiply charged ions. Progress report, March 1, 1975--February 29, 1976
Collision strengths for electron impact excitation of N$sup 4+$ and Ne$sup 7+$ are calculated for energies up to three times threshold energy for transitions 2s-2p, 2l-3l' where l = 0,1 and l' = 0, 1, 2. A partial wave expansion for the incident electron wave function is made. For an electron with low orbital angular momentum, a closely-coupled expansion method over the 2s, 2p, 3d, 3p and 3d states of the ion is necessary in order to obtain an accuracy of 10 percent. Coulomb-Born approximation methods cannot be relied on for most transitions at the energies considered. A program for regular and irregular Whittaker functions has been developed. This will aid in an investigation of resonance structure in the collision strengths. Differing calculational methods are being investigated in order to compare speed and accuracy. (auth)
- Research Organization:
- Louisiana State Univ., Baton Rouge (USA). Dept. of Physics and Astronomy
- NSA Number:
- NSA-33-013019
- OSTI ID:
- 4116408
- Report Number(s):
- ORO--4881-3
- Country of Publication:
- United States
- Language:
- English
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640304* --Physics Research--Atomic
Molecular & Chemical Physics--Collision Phenomena
CROSS SECTIONS
ENERGY-LEVEL TRANSITIONS
MATHEMATICAL MODELS
N60400* --Physics (Atomic & Molecular)--Collision Phenomena