Shape resonance
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A shape resonance is a metastable state in which an electron is trapped due to the shape of a potential barrier.[1] Altunata[2] describes a state as being a shape resonance if, "the internal state of the system remains unchanged upon disintegration of the quasi-bound level." A more general discussion of resonances and their taxonomies in molecular system can be found in the review article by Schulz,;[3][4] for the discovery of the Fano resonance line-shape[5] and for the Majorana pioneering work in this field[6] by Antonio Bianconi; and for a mathematical review by Combes et al.[7]