We study theoretically the steady-state and ultrafast vibrational spectroscopy, in the OD-stretch region, of dilute HOD in aqueous solutions of sodium bromide. Based on electronic-structure calculations on clusters containing salt ions and water, we develop new spectroscopic maps that enable us to undertake this study. We calculate OD-stretch absorption line shapes as a function of salt concentration, finding good agreement with experiment. We provide molecular-level understandings of the monotonic (as a function of concentration) blueshift, and nonmonotonic line width. We also calculate the frequency time-correlation function, as measured by spectral diffusion experiments. Here again we obtain good agreement with experiment, finding that at the highest salt concentration spectral diffusion slows down by a factor of 3 or 4 (compared to pure water). For longer times than can be accessed experimentally, we find that spectral diffusion is very complicated, with processes occurring on multiple time scales. We argue that from 6 to 40 ps, relaxation involves anionic solvation shell rearrangements. Finally, we consider our findings within the general context of the Hofmeister series, concluding that this series must reflect only local ordering of water molecules.
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14 October 2009
Research Article|
October 13 2009
Water structure, dynamics, and vibrational spectroscopy in sodium bromide solutions
Y.-S. Lin;
Y.-S. Lin
Department of Chemistry and Theoretical Chemistry Institute,
University of Wisconsin
, Madison, Wisconsin 53706, USA
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B. M. Auer;
B. M. Auer
Department of Chemistry and Theoretical Chemistry Institute,
University of Wisconsin
, Madison, Wisconsin 53706, USA
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J. L. Skinner
J. L. Skinner
a)
Department of Chemistry and Theoretical Chemistry Institute,
University of Wisconsin
, Madison, Wisconsin 53706, USA
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a)
Electronic mail: [email protected].
J. Chem. Phys. 131, 144511 (2009)
Article history
Received:
July 02 2009
Accepted:
September 14 2009
Citation
Y.-S. Lin, B. M. Auer, J. L. Skinner; Water structure, dynamics, and vibrational spectroscopy in sodium bromide solutions. J. Chem. Phys. 14 October 2009; 131 (14): 144511. https://doi.org/10.1063/1.3242083
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