Rapid Communication in Photoscience

Korean Society of Photoscience (한국광과학회)
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Charges of TIP4P water model for mixed quantum/classical calculations of OH stretching frequency in liquid water

  • Jeon, Kiyoung (Department of Chemistry, Chungbuk National University) ;
  • Yang, Mino (Department of Chemistry, Chungbuk National University)
  • Received : 2016.06.10
  • Accepted : 2016.06.23
  • Published : 2016.06.30
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Abstract

The potential curves of OH bonds of liquid water are inhomogeneous because of a variety of interactions with other molecules and this leads to a wide distribution of vibrational frequency which hampers our understanding of the structure and dynamics of water molecules. Mixed quantum/classical (QM/CM) calculation methods are powerful theoretical techniques to help us analyze experimental data of various vibrational spectroscopies to study such inhomogeneous systems. In a type of those approaches, the interaction energy between OH bonds and other molecules is approximately represented by the interaction between the charges located at the appropriate interaction sites of water molecules. For this purpose, we re-calculated the values of charges by comparing the approximate interaction energies with quantum chemical interaction energies. We determined a set of charges at the TIP4P charge sites which better represents the quantum mechanical potential curve of OH bonds of liquid water.

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References

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