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  Why Bound states appears as pole of reflection or transmission coefficients

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In Quantum mechanics, Why Bound states appears as pole of reflection or transmission coefficients ?

asked Jun 4, 2019 in Q&A by anonymous [ no revision ]

1 Answer

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Because if the meduim has bound states (the ground and excited states), it reflects and transmits non resonant frequencies in a "normal" way.

Closeness of the incoming wave frequency to some resonant transitions in the medium makes reflection and transmission "anomalous" processes, with active other channels of "dissipation" of the absorbed incident wave, rather than just slight polarization of the medium in the former case.

answered Jun 4, 2019 by Vladimir Kalitvianski (102 points) [ no revision ]

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