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Low-frequency Raman study of water isotopes

Author

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  • Amo, Yuko
  • Tominaga, Yasunori

Abstract

Depolarized low-frequency Raman spectra of H2O,D2O,H218O, and D218O are measured from 266 to 350 K. The reduced Raman spectra below 250cm−1 are reproduced by a superposition of one relaxation mode and two damped harmonic oscillators. The multiple random telegraph model, which takes into account the inertia and memory effects is applied to analyze the central relaxation component. The 180cm−1 mode corresponds to vibration of the oxygen atom. The hydrogen isotopes affect the relaxation time causing its variation. The relaxation time is considered to correspond to the duration of fluctuation of the local structure in liquid water. The intensity of the 50cm−1 mode decreases with increasing temperature and finally vanishes above about 300–310 K. The 50cm−1 mode can be distinguished from the relaxation mode when the relaxation time is more than five times longer than the period of the 50cm−1 vibration mode.

Suggested Citation

  • Amo, Yuko & Tominaga, Yasunori, 2000. "Low-frequency Raman study of water isotopes," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 276(3), pages 401-412.
    • Handle: RePEc:eee:phsmap:v:276:y:2000:i:3:p:401-412
    DOI: 10.1016/S0378-4371(99)00457-4
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