Consider a gas of atoms that might serve as a laser medium but that is in equilibrium, with no population inversions. A photon gas coexists with the atoms. Would a photon whose energy is precisely the difference between two atomic energy states be more likely to be absorbed or to induce a stimulated emission or neither? We expect that in equilibrium the numbers of atoms at different levels and the number of photons of a given energy should be stable. Is your answer compatible?
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