Issue 4, 2010

Signatures of coherent vibrational energy transfer in IR and Raman line shapes for liquid water

Abstract

We calculate theoretical IR and Raman line shapes for the OH stretch region of liquid water, using mixed quantum/classical and electronic-structure/molecular-dynamics methods. Our approach improves upon the time-averaging approximation used earlier for the same problem, and our results are in excellent agreement with experiment. Previous analysis of theoretical results for this problem considered the extent of delocalization (over local OH stretch excitations) of the instantaneous vibrational eigenstates. In this work we present a complementary analysis in the time-domain, by decomposing the appropriate response functions into diagonal and off-diagonal contributions (in the local mode basis). Our analysis indicates that all vibrational spectra show signatures of coherent vibrational energy transfer. This is manifest in different (IR, isotropic and depolarized Raman) experiments to different extents, because of the competition between coherent energy transfer and rotational disorder.

Graphical abstract: Signatures of coherent vibrational energy transfer in IR and Raman line shapes for liquid water

Article information

Article type
Paper
Submitted
04 Sep 2009
Accepted
28 Oct 2009
First published
02 Dec 2009

Phys. Chem. Chem. Phys., 2010,12, 982-991

Signatures of coherent vibrational energy transfer in IR and Raman line shapes for liquid water

M. Yang and J. L. Skinner, Phys. Chem. Chem. Phys., 2010, 12, 982 DOI: 10.1039/B918314K

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