Nonlinear measurements of kinetics and generalized dynamical modes. II. Application to a simulation of solvation dynamics in an ionic liquid

Solvation dynamics in ionic liquids show features that are often associated with supercooled liquids, including “stretched” nonexponential relaxation. To better understand the mechanism behind stretching, nonlinear mode-correlation methods proposed Paper I [S. R. Hodge and M. A. Berg, J. Chem. Phys. 155, 024122 (2021)] applied to a simulation of prototypical liquid. A full Green’s function is recovered. In addition, specific tests for non-Gaussian made. No deviations from Gaussian found. This finding incompatible rate heterogeneity as cause relaxation appears be conflict an earlier multidimensional analysis same data. Although this not resolved here, work does demonstrate practicality face finite datasets calculations.