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Einstein Coefficients

Coefficients used in the quantum theory of radiation, related to the possibility of a transition occurring between the ground state and an excited state in the processes of induced emission and spontaneous emission.

For an atom exposed to electromagnetic radiation, the rate of absorption Ra is give by Ra = Bp, where p is the density of electromagnetic radiation and B is Einstein B coefficient associated with absorption

The rate of induced emission is also given by Bp with the coefficient B of induced emission being equal to the coefficient of absorption.

These coefficients were put forward by Albert Einstein in 1916 -17 in his analysis of the quantum theory of radiation.

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