High Quality Content by WIKIPEDIA articles! A shape resonance is a metastable state in which an electron is trapped due the shape of a potential barrier. Serhan 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, early description of shape and Fano resonance by Bianconi, or a mathematical review by Combes et al.. In quantum mechanics, a shape resonance, in contrast to a Feshbach resonance, is a resonance which is not turned into a bound state if the coupling between some degrees of freedom and the degrees of freedom associated to the fragmentation (reaction coordinates) are set to zero.
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