Lowest frequency mode in Raman susceptibility: 2-propanol from ambient to supercritical condition

摘要

We report the first observation of the low-frequency Raman spectra of 2-propanol from ambient to supercritical condition. Phenomenological analysis is applied to the reduced Raman spectra. The low-frequency component is decomposed into two components: the lowest mode represented by a MRT(multiple random telegraph) model and the 2nd mode represented by a modified Gaussian. Only the characteristic time of the lowest mode sensitively depends on density and decreases with increasing density. The integrated intensity of each mode is proportional to the density.