Journal
CHEMICAL PHYSICS
Volume 392, Issue 1, Pages 96-104Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chemphys.2011.10.025
Keywords
Water-vapor interface; Ab initio molecular dynamics; Hydrogen bond fluctuations; Spectral diffusion; Time series analysis; Void analysis
Funding
- Department of Science and Technology (DST), Government of India
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We present a theoretical study of the structure and dynamics of water-vapor interface by means of ab initio molecular dynamics simulations. The inhomogeneous density, hydrogen bond and orientational profiles, voids and vibrational frequency distributions are investigated. We have also studied various dynamical properties of the interface such as diffusion, orientational relaxation, hydrogen bond dynamics and vibrational frequency fluctuations. The diffusion and orientational relaxation of water molecules are found to be faster at the interface which can be correlated with the voids present in the system. The hydrogen bond dynamics, however, is found to be slightly slower at the interface than that in bulk water. The correlations of hydrogen bond relaxation with the dynamics of vibrational frequency fluctuations are also discussed. (C) 2011 Elsevier B. V. All rights reserved.
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