We report a database consisting of the putative minima and ∼3.2 × 106 local minima lying within 5 kcal/mol from the putative minima for water clusters of sizes n = 3–25 using an improved version of the Monte Carlo temperature basin paving (MCTBP) global optimization procedure in conjunction with the ab initio based, flexible, polarizable Thole-Type Model (TTM2.1-F, version 2.1) interaction potential for water. Several of the low-lying structures, as well as low-lying penta-coordinated water networks obtained with the TTM2.1-F potential, were further refined at the Møller-Plesset second order perturbation (MP2)/aug-cc-pVTZ level of theory. In total, we have identified 3 138 303 networks corresponding to local minima of the clusters n = 3–25, whose Cartesian coordinates and relative energies can be obtained from the webpage https://sites.uw.edu/wdbase/. Networks containing penta-coordinated water molecules start to appear at n = 11 and, quite surprisingly, are energetically close (within 1–3 kcal/mol) to the putative minima, a fact that has been confirmed from the MP2 calculations. This large database of water cluster minima spanning quite dissimilar hydrogen bonding networks is expected to influence the development and assessment of the accuracy of interaction potentials for water as well as lower scaling electronic structure methods (such as different density functionals). Furthermore, it can also be used in conjunction with data science approaches (including but not limited to neural networks and machine and deep learning) to understand the properties of water, nature’s most important substance.
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7 December 2019
Research Article|
December 04 2019
Atlas of putative minima and low-lying energy networks of water clusters n = 3–25
Avijit Rakshit;
Avijit Rakshit
1
School of Computational and Integrative Sciences, Jawaharlal Nehru University
, New Delhi 110067, India
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Pradipta Bandyopadhyay;
Pradipta Bandyopadhyay
a)
1
School of Computational and Integrative Sciences, Jawaharlal Nehru University
, New Delhi 110067, India
a)Authors to whom correspondence should be addressed: [email protected]; [email protected]; and [email protected]
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Joseph P. Heindel;
Joseph P. Heindel
2
Department of Chemistry, University of Washington
, Seattle, Washington 98195, USA
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Sotiris S. Xantheas
Sotiris S. Xantheas
a)
2
Department of Chemistry, University of Washington
, Seattle, Washington 98195, USA
3
Advanced Computing, Mathematics and Data Division, Pacific Northwest National Laboratory
, 902 Battelle Boulevard, P.O. Box 999, MS K1-83, Richland, Washington 99352, USA
a)Authors to whom correspondence should be addressed: [email protected]; [email protected]; and [email protected]
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a)Authors to whom correspondence should be addressed: [email protected]; [email protected]; and [email protected]
J. Chem. Phys. 151, 214307 (2019)
Article history
Received:
September 19 2019
Accepted:
November 13 2019
Citation
Avijit Rakshit, Pradipta Bandyopadhyay, Joseph P. Heindel, Sotiris S. Xantheas; Atlas of putative minima and low-lying energy networks of water clusters n = 3–25. J. Chem. Phys. 7 December 2019; 151 (21): 214307. https://doi.org/10.1063/1.5128378
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