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High-Level VSCF/VCI Calculations Decode the Vibrational Spectrum of the Aqueous Proton

Journal Article · · Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry
 [1];  [2];  [2];  [2];  [3]
  1. Emory Univ., Atlanta, GA (United States); The University of Chicago
  2. Univ. of Chicago, IL (United States). James Frank Inst., and Inst. for Biophysical Dynamics
  3. Emory Univ., Atlanta, GA (United States)
+ Show Author Affiliations
We report that the hydrated excess proton is a common species in aqueous chemistry which complexes with water in a variety of structures. The infrared spectrum of the aqueous proton is particularly sensitive to this array of structures, which manifests as continuous IR absorption from 1000-3000 cm-1 known as the “proton continuum”. Because of the extreme breadth of the continuum and strong anharmonicity of the involved vibrational modes, this spectrum has eluded straightforward interpretation and simulation. Using protonated water hexamer clusters from reactive molecular dynamics trajectories, and focusing on their central H+(H2O)2 structures’ spectral contribution, we reproduce the linear IR spectrum of the aqueous proton with a high-level local- monomer quantum method and highly accurate many-body potential energy surface. The accuracy of this approach is first verified in the vibrational spectra of the two isomers of the protonated water hexamer in the gas phase. We then apply this approach to 800 H+(H2O)6 clusters, also written as [H+(H2O)2](H2O)4, drawn from MS-EVB simulations of the bulk liquid to calculate the infrared spectrum of the aqueous proton complex. Incorporation of anharmonic effects to the vibrational potential and quantum mechanical treatment of the proton produce better agreement to the infrared spectrum compared to the double-harmonic approximation. We assess the correlation of the pro- ton stretching mode with different atomistic coordinates, finding the best correlation with $$\langle$$ROH$$\rangle$$, the expectation value of the proton-oxygen distance ROH. Finally, we also decompose the IR spectrum based on normal mode vibrations and $$\langle$$ROH$$\rangle$$ to provide insight on how different frequency regions in the continuum report on different configurations, vibrational modes, and mode couplings.
Research Organization:
Univ. of Chicago, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0014305
OSTI ID:
1599995
Journal Information:
Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry, Journal Name: Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry Journal Issue: 33 Vol. 123; ISSN 1520-6106
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

Nature of Excess Hydrated Proton at the Water–Air Interface journal December 2019

Figures / Tables (7)

Figure 1(p. 10)figure Figure 1
Figure 2(p. 12)figure Figure 2
Figure 3(p. 14)figure Figure 3
Figure 4(p. 18)figure Figure 4
Figure 5(p. 21)figure Figure 5
Table 1(p. 22)table Table 1
Figure 6(p. 23)figure Figure 6

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY