Non-Markovian Effects in Far-Wing Light Scattering
The quantum regression theorem (QRT), as discussed, e.g., by Lax1 is a very powerful technique for the calculation of spectra emitted by systems driven by an external field. We shall be discussing the domain of validity of the theorem in the context of collisional line broadening.2 We shall show that those regions of the spectrum that the theorem does not address still yield, in case of line broadening, to straightforward calculations. Moreover, these regions provide considerable insight into when and how the QRT works. They also provide, as one might expect, a probe of the underlying microscopic dynamics.
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