CANCELLATION EFFECTS IN COMPUTED ATOMIC TRANSITION PROBABILITIES

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Abstract
The common method of computing atomic transition probabilities involves the expansion of atomic wavefunctions in terms of single-configuration, LS-coupled basis functions. Calculated values are frequently rendered very unreliable by cancellation effects resulting from intermediate-coupling and configuration-interaction mixing of basis functions. Examples are discussed in the spectra of Ar I, Al I, and Si I. The general circumstances under which computed transition probabilities may be expected to be most reliable are reviewed

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