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    On the role of hydrogen-bond exchanges in the spectral diffusion of water

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    Piskulich_et_al_preprint.pdf (672.1Kb)
    Issue Date
    2021-02-08
    Author
    Piskulich, Zeke A.
    Laage, Damien
    Thompson, Ward H.
    Type
    Article
    Article Version
    Scholarly/refereed, author accepted manuscript
    Published Version
    https://aip.scitation.org/doi/10.1063/5.0041270
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    Abstract
    The dynamics ofa vibrational frequency in a condensed phase environment, i.e., the spectral diffusion, has attracted considerable interest over the last two decades. A significant impetus has been the development of two-dimensional infrared (2D-IR) photon-echo spectroscopy that represents a direct experimental probe of spectral diffusion, as measured by the frequency–frequency time correlation function (FFCF). In isotopically dilute water, which is perhaps the most thoroughly studied system, the standard interpretation of the longest timescale observed in the FFCF is that it is associated with hydrogen-bond exchange dynamics. Here, we investigate this connection by detailed analysis of both the spectral diffusion timescales and their associated activation energies. The latter are obtained from the recently developed fluctuation theory for the dynamics approach. The results show that the longest timescale of spectral diffusion obtained by the typical analysis used cannot be directly associated with hydrogen-bond exchanges. The hydrogen-bond exchange time does appear in the decay of the water FFCF, but only as an additional, small-amplitude (<3%) timescale. The dominant contribution to the long-time spectral diffusion dynamics is considerably shorter than the hydrogen-bond exchange time and exhibits a significantly smaller activation energy. It thus arises from hydrogen-bond rearrangements, which occur in between successful hydrogen-bond partner exchanges, and particularly from hydrogen bonds that transiently break before returning to the same acceptor. Published
    URI
    http://hdl.handle.net/1808/32198
    DOI
    https://doi.org/10.1063/5.0041270
    Collections
    • Chemistry Scholarly Works [586]
    Citation
    Z. A. Piskulich, D. Laage, and W. H. Thompson, On the role of hydrogen-bond exchanges in the spectral diffusion of water. J. Chem. Phys. 154, 064501 (2021).

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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