Effects of core-valence and core-core correlation on the line strength of the resonance lines in Li i and Na i
- 1 March 1994
- journal article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 49 (3), 2181-2184
- https://doi.org/10.1103/physreva.49.2181
Abstract
The resonance lines in Li I and Na I both exhibit a puzzling discrepancy between experiment and accurate ab initio calculations. Only results from a semiempirical method, that in principal neglects core-core correlation, agree with the experiments. The agreement with a multiconfiguration Hartree-Fock calculation, including only core-valence correlation, shows that this might be fortuitous. A method for including some core-core correlation is designed and gives results in excellent agreement with other accurate ab initio methodsKeywords
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