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Thämer M, De Marco L, Ramasesha K, et al. Ultrafast 2D IR spectroscopy of the excess proton in liquid water. Science. 2015;350(6256):78-82doi: 10.1126/science.aab3908.
Thämer, M., De Marco, L., Ramasesha, K., Mandal, A., & Tokmakoff, A. (2015). Ultrafast 2D IR spectroscopy of the excess proton in liquid water. Science (New York, N.Y.), 350(6256), 78-82. https://doi.org/10.1126/science.aab3908
Thämer, Martin, et al. "Ultrafast 2D IR spectroscopy of the excess proton in liquid water." Science (New York, N.Y.) vol. 350,6256 (2015): 78-82. doi: https://doi.org/10.1126/science.aab3908
Thämer M, De Marco L, Ramasesha K, Mandal A, Tokmakoff A. Ultrafast 2D IR spectroscopy of the excess proton in liquid water. Science. 2015 Oct 02;350(6256):78-82. doi: 10.1126/science.aab3908. PMID: 26430117.
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Science. 2015 Oct 02;350(6256):78-82. doi: 10.1126/science.aab3908.

Ultrafast 2D IR spectroscopy of the excess proton in liquid water.

Science (New York, N.Y.)

Martin Thämer, Luigi De Marco, Krupa Ramasesha, Aritra Mandal, Andrei Tokmakoff

Affiliations

  1. Department of Chemistry, Institute for Biophysical Dynamics, and James Franck Institute, The University of Chicago, Chicago, IL 60637, USA.
  2. Department of Chemistry, Institute for Biophysical Dynamics, and James Franck Institute, The University of Chicago, Chicago, IL 60637, USA. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
  3. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
  4. Department of Chemistry, Institute for Biophysical Dynamics, and James Franck Institute, The University of Chicago, Chicago, IL 60637, USA. [email protected].

PMID: 26430117 DOI: 10.1126/science.aab3908

Abstract

Despite decades of study, the structures adopted to accommodate an excess proton in water and the mechanism by which they interconvert remain elusive. We used ultrafast two-dimensional infrared (2D IR) spectroscopy to investigate protons in aqueous hydrochloric acid solutions. By exciting O-H stretching vibrations and detecting the spectral response throughout the mid-IR region, we observed the interaction between the stretching and bending vibrations characteristic of the flanking waters of the Zundel complex, [H(H2O)2](+), at 3200 and 1760 cm(-1), respectively. From time-dependent shifts of the stretch-bend cross peak, we determined a lower limit on the lifetime of this complex of 480 femtoseconds. These results suggest a key role for the Zundel complex in aqueous proton transfer.

Copyright © 2015, American Association for the Advancement of Science.

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