■

A. Ma and R.M. Stratt, "Fifth-Order Raman Spectrum of an Atomic Liquid: Simulation and Instantaneous-Normal-Mode Calculation," Phys. Rev. Lett. 85, 1004 (2000); S. Saito and I. Ohmine, "Off-Resonant Fifth-Order Response Function for Two-Dimensional Raman Spectroscopy of Liquids CS2 and H2O," ibid. 88, 207401 (2002).