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A variational method for resonance widths suggested by Bransden and Dalgarno is examined in detail. Its formal equivalence to other theories is demonstrated. The equations which result from the use of a linear combination of trial functions are developed. Calculations are presented for several low-lying resonances in H - by use of simple representations of the quasi-bound wave functions. The widths are in reasonable agreement with those found by the close-coupling method.
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C. Böttcher (1969) studied this question.
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