Breakdown of narrowing limit and overdamped limit of relaxation mode in low-frequency Raman spectra of ethylene glycol

Yuko Amo and Yasunori Tominaga

Physica A: Statistical Mechanics and its Applications, 1999, vol. 265, issue 3, 410-415

Abstract: We report depolarized low-frequency Raman spectra of ethylene glycol in wide frequency range from 0.01 to 300cm−1. The reduced Raman spectrum is reproduced with the use of a fitting function which contains two relaxation modes and three damped harmonic oscillator modes. The slow relaxation mode is characterized by the Gaussian–Markovian process under the narrowing limit. While for the fast relaxation mode the spectral profile cannot be reproduced by the function which is approximated by both narrowing limit and overdamped limit. This is the first report on the breakdown of both narrowing limit and overdamped limit in the relaxation mode of low-frequency Raman spectra.

Keywords: Low-frequency Raman scattering; Two-state jump process (search for similar items in EconPapers)
Date: 1999
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:265:y:1999:i:3:p:410-415

DOI: 10.1016/S0378-4371(98)00650-5

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