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Phase-Sensitive Vibrational SFG Spectra from Simple Classical Force Field Molecular Dynamics Simulations
journal contribution
posted on 2020-07-02, 14:15 authored by Ondřej Kroutil, Simone Pezzotti, Marie-Pierre Gaigeot, Milan PředotaWe show that phase-sensitive
vibrational sum frequency generation
(SFG) spectra of solid/water and air/water interfaces, neutral and
charged, can be successfully predicted using classical molecular dynamics
(CMD) simulations in combination with simple nonpolarizable force
fields (FFs). This can be achieved when employing velocity–velocity
autocorrelation functions weighted by parameterized Raman and atomic
polar tensors for the computation of the SFG. This procedure avoids
computing polarizability tensors and dipole moments using either costly
ab initio molecular dynamics (AIMD) simulations or CMD simulations
with more complex and computationally demanding FFs. Such a methodology
paves the way to a broad usage and computationally low-cost theoretical
SFG spectroscopy, as even flexible nonpolarizable water models and
common FFs for inorganic surfaces can provide good predictions of
the SFG spectra, in rather good qualitative agreement with AIMD and/or
experiments. The strongly reduced computational cost in our approach
opens the possibility to study larger systems for long periods of
time, for example, allowing a detailed characterization of the electric
double-layer formation at interfaces with “environmentally
relevant” ionic concentrations (mM), extracting fingerprints
by theoretical CMD–SFG spectroscopy.
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nonpolarizable force fieldsdynamicpolarizability tensorsSFG spectraphase-sensitive vibrational sum fre...CMD simulationsSFG spectroscopyinterfaceparameterized RamanFFAIMDdouble-layer formationnonpolarizable water modelsSimple Classical Force Field Molecu...Phase-Sensitive Vibrational SFG Spectracomputationallyab initio
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