In slow spectral diffusion, photon intensity and fluctuations depend on nonequilibrium environmental traits at short times but become independent in steady state; in fast diffusion, line shape and Mandel's parameter are independent of nonequilibrium characteristics due to rapid relaxation.
When the nonequilibrium parameter a = 0, the two split peaks of both the line shape I(t) and Mandel’s parameter Q(t) are symmetric
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Photon counting statistics in the presence of spectral diffusion induced by nonequilibrium environmental fluctuations
In slow spectral diffusion, photon intensity and fluctuations depend on nonequilibrium environmental traits at short times but become independent in steady state; in fast diffusion, line shape and Mandel's parameter are independent of nonequilibrium characteristics due to rapid relaxation.