High-Level VSCF/VCI Calculations Decode the Vibrational Spectrum of the Aqueous Proton
Abstract
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.
- Authors:
-
- Emory Univ., Atlanta, GA (United States)
- Univ. of Chicago, IL (United States). James Frank Inst., and Inst. for Biophysical Dynamics
- Publication Date:
- Research Org.:
- Univ. of Chicago, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1599995
- Grant/Contract Number:
- SC0014305; CHE-1463552
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry
- Additional Journal Information:
- Journal Volume: 123; Journal Issue: 33; Journal ID: ISSN 1520-6106
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Yu, Qi, Carpenter, William B., Lewis, Nicholas H. C., Tokmakoff, Andrei, and Bowman, Joel M. High-Level VSCF/VCI Calculations Decode the Vibrational Spectrum of the Aqueous Proton. United States: N. p., 2019.
Web. doi:10.1021/acs.jpcb.9b05723.
Yu, Qi, Carpenter, William B., Lewis, Nicholas H. C., Tokmakoff, Andrei, & Bowman, Joel M. High-Level VSCF/VCI Calculations Decode the Vibrational Spectrum of the Aqueous Proton. United States. https://doi.org/10.1021/acs.jpcb.9b05723
Yu, Qi, Carpenter, William B., Lewis, Nicholas H. C., Tokmakoff, Andrei, and Bowman, Joel M. Tue .
"High-Level VSCF/VCI Calculations Decode the Vibrational Spectrum of the Aqueous Proton". United States. https://doi.org/10.1021/acs.jpcb.9b05723. https://www.osti.gov/servlets/purl/1599995.
@article{osti_1599995,
title = {High-Level VSCF/VCI Calculations Decode the Vibrational Spectrum of the Aqueous Proton},
author = {Yu, Qi and Carpenter, William B. and Lewis, Nicholas H. C. and Tokmakoff, Andrei and Bowman, Joel M.},
abstractNote = {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.},
doi = {10.1021/acs.jpcb.9b05723},
journal = {Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry},
number = 33,
volume = 123,
place = {United States},
year = {Tue Jul 30 00:00:00 EDT 2019},
month = {Tue Jul 30 00:00:00 EDT 2019}
}
Web of Science
Figures / Tables:
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