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Machine Learning Approach for Describing Water OH Stretch Vibrations

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Title
Machine Learning Approach for Describing Water OH Stretch Vibrations
Author(s)
Kijeong Kwac; Holly Freedman; Minhaeng Cho
Publication Date
2021-10-12
Journal
Journal of Chemical Theory and Computation, v.17, no.10, pp.6353 - 6365
Publisher
American Chemical Society
Abstract
© 2021 American Chemical Society.A machine learning approach employing neural networks is developed to calculate the vibrational frequency shifts and transition dipole moments of the symmetric and antisymmetric OH stretch vibrations of a water molecule surrounded by water molecules. We employed the atom-centered symmetry functions (ACSFs), polynomial functions, and Gaussian-type orbital-based density vectors as descriptor functions and compared their performances in predicting vibrational frequency shifts using the trained neural networks. The ACSFs perform best in modeling the frequency shifts of the OH stretch vibration of water among the types of descriptor functions considered in this paper. However, the differences in performance among these three descriptors are not significant. We also tried a feature selection method called CUR matrix decomposition to assess the importance and leverage of the individual functions in the set of selected descriptor functions. We found that a significant number of those functions included in the set of descriptor functions give redundant information in describing the configuration of the water system. We here show that the predicted vibrational frequency shifts by trained neural networks successfully describe the solvent-solute interaction-induced fluctuations of OH stretch frequencies.
URI
https://pr.ibs.re.kr/handle/8788114/10647
DOI
10.1021/acs.jctc.1c00540
ISSN
1549-9618
Appears in Collections:
Center for Molecular Spectroscopy and Dynamics(분자 분광학 및 동력학 연구단) > 1. Journal Papers (저널논문)
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