Abstract
The Raman spectrum of a solid is formulated using quantum field theory. The photons are assumed to couple via localised electronic states, e.g. paramagnetic impurities. The laser is assumed to be of low power and to have a frequency well away from any electronic resonance. It is shown that the phonon-induced shift and width of each of the lines corresponding to an electronic transition, a first-order phonon line, and a vibronic transition is formally the same whether the transition is studied by absorption or by Raman spectroscopy. Width and shift contributions are given to second order in broadening interactions for the second-order phonon Raman spectrum. These results exhibit complications in some attempts to compare broadening parameters in different experiments. Some consequential adjustments to formulations of the spectrum of resonance fluorescence are suggested.
Published Version
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