Quantifying Energetic and Entropic Pathways in Molecular Systems

Beyerle, Eric R.; Mehdi, Shams; Tiwary, Pratyush

doi:10.1021/acs.jpcb.2c01782

Quantifying Energetic and Entropic Pathways in Molecular Systems

Journal Article · Mon May 23 00:00:00 EDT 2022 · Journal of Physical Chemistry. B

DOI:https://doi.org/10.1021/acs.jpcb.2c01782· OSTI ID:1991216

Beyerle, Eric R. ^[1]; ^[2]; ^[2]

Univ. of Maryland, College Park, MD (United States); University of Maryland at College Park
Univ. of Maryland, College Park, MD (United States)

When examining dynamics occurring at nonzero temperatures, both energy and entropy must be taken into account to describe activated barrier crossing events. Furthermore, good reaction coordinates need to be constructed to describe different metastable states and the transition mechanisms between them. Here we use a physics-based machine learning method called state predictive information bottleneck (SPIB) to find nonlinear reaction coordinates for three systems of varying complexity. SPIB is able to correctly predict an entropic bottleneck for an analytical flat-energy double-well system and identify the entropy- and energy-dominated pathways for an analytical four-well system. Lastly, for a simulation of benzoic acid permeation through a lipid bilayer, SPIB is able to discover the entropic and energetic barriers to the permeation process. Given these results, we thus establish that SPIB is a reasonable and robust method for finding the important entropy, energy, and enthalpy barriers in physical systems, which can then be used to enhance the understanding and sampling of different activated mechanisms.

View Accepted Manuscript (DOE)

Research Organization:: University of Maryland, College Park, MD (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0021009

OSTI ID:: 1991216

Alternate ID(s):: OSTI ID: 1977991

Journal Information:: Journal of Physical Chemistry. B, Journal Name: Journal of Physical Chemistry. B Journal Issue: 21 Vol. 126; ISSN 1520-6106

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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