Excitation and ionization of highly charged ions by electron impact: Progress report for period May 1, 1986-April 30, 1987
(1) Cross sections and rate coefficients with inclusion of mixing effects have been obtained for innershell ionization of Na-like ions. This is an important mechanism for populating the excited levels of Neon-like ions and the importance increases with Z. (2) Cross sections and rate coefficients with inclusion of mixing effects have been obtained for innershell ionization of Li-like ions. This appears to be an important mechanism for populating the excited levels of He-like ions and its importance also increases with Z. (3) The collision strengths have been calculated for all 1171 innershell excitation transitions from the five lower levels of the form 1s/sup 2/2s/sup 2/2p/sup 6/3l/sup 2/L/sub J/ to the doubly excited upper levels of kinds 1s/sup 2/2s/sup 2/2p/sup 5/(3l'3l''/sup 2S''+1/L''/sub J'/ and 1s/sup 2/2s2p/sup 6/(3l'3l''/sup 2S''+1/L'')/sup 2S'+1/L'/sub J'/ in 22 Na-like ions. These upper levels can radiatively decay, which produces satellite lines to those due to n = 3 to n = 2 transitions in neon-like ions, or they can autoionize, which populates the 1s/sup 2/2s/sup 2/2p/sup 6/ /sup 1/S/sub 0/ ground level of neon-like ions. Considerable progress has also been made on our new quasirelativistic code development. After checking the accuracy for hydrogenic ions with Z values up to 90, we have now obtained preliminary quasirelativistic results for both structure and collision strengths for neon-like ions. These generally agree well with fully relativistic calculations. 41 refs.
- Research Organization:
- Pennsylvania State Univ., University Park (USA). Dept. of Astronomy
- DOE Contract Number:
- FG02-85ER53208
- OSTI ID:
- 6568275
- Report Number(s):
- DOE/ER/53208-2; ON: DE87009340
- Country of Publication:
- United States
- Language:
- English
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