We generalize the multimode Brownian oscillator model for a two-level system to optical four wave mixing spectroscopy of a multilevel system, based on the recent work of Sung and Silbey [J. Chem. Phys. 115, 9266 (2001)]. For the Ohmic limit where the phenomenological Langevin equation becomes correct, we present exact expressions for energy-gap correlation functions in the strong damping case as well as in the weak damping case.
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Sung et al. (2003) studied this question.
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