Bulletin of the Korean Chemical Society

  • 제34권2호
  • /
  • Pages.553-557
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  • 2013
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  • 0253-2964(pISSN)
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  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
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Car-Parrinello Molecular Dynamics Study for the Isotope Effect on OH Vibration in Ice Ih

  • Yoon, Yeohoon (Frick Laboratory, Department of Chemistry, Princeton University)
  • 투고 : 2012.10.17
  • 심사 : 2012.11.21
  • 발행 : 2013.02.20
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초록

The stretching vibration of OH of ice Ih is studied by Car-Parrinello molecular dynamics in regarding the effect of mixed H/D contamination while the vibrational spectrum is considered by velocity-velocity autocorrelations of the sampled ensemble. When hydrogen atoms are immersed randomly into the deuterated ice, a typical vibrational frequency of OH stretching mode is observed to be similar to that from the pure $H_2O$ ice. When focusing on the correlation of isolated neighboring OH stretching, a narrower and blue shifted peak is observed at the high frequency range as a result of the screening from the complex many body correlations by $D_2O$ environment. It is also specifically related to the symmetric intermolecular correlations between neighboring OH stretching modes. More enhanced high frequency range can be explained by the expansion of such two body correlations to collective many body correlations among all possible OH stretching modes. This contribution becomes important when it involves in chemical interactions via excitation of such vibrational states.

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