We first note that J(ω) can be reconstructed from resonance Raman (RR) spectroscopy as this technique provides detailed quantitative structural information about molecules in solution. While RR experiments are routinely used to investigate the vibrational structure and photodynamics of molecules , their utility for decoherence studies had not been appreciated before. A leading technique used to reconstruct J(ω) for molecules is difference fluorescence line narrowing spectra ∆FLN). The advantage of RR over ∆FLN is that it can be used in both fluorescent and non-fluorescent molecules (instead of only fluorescent), in solvent (instead of glass matrices), at room temperature (instead of cryogenic temperatures), and that it offers the possibility of varying the nature of the solvent and the temperature.