A technique is presented which can be used to compute the complex poles of the resolvent (defined as resonances) directly by use of a square-integrable basis without a coordinate rotation and without explicitly imposing a boundary condition such as a Siegert resonant boundary condition. Such a technique is directly applicab`le to all phenomena which can be put in the form of a resonance such as photoionization, field ionization, and electron resonances in atoms and molecules.
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B. R. Junker (1980) studied this question.
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