Regular Article

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

Yamagata University 1-4-12 Kojirakawa-machi, Yamagata 990-8560, Japan

^a e-mail: apj@cm.kj.yamagata-u.ac.jp

Received: 13 March 2019
Received in final form: 31 July 2019
Published online: 15 January 2020

Abstract

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.