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Title: Importance of self-interaction-error removal in density functional calculations on water cluster anions

Abstract

Accurate description of the excess charge in water cluster anions is challenging for standard semi-local and (global) hybrid density functional approximations (DFAs). Using the recent unitary invariant implementation of the Perdew–Zunger self-interaction correction (SIC) method using Fermi-Löwdin orbitals, we assess the effect of self-interaction error on the vertical detachment energies of water cluster anions with the local spin density approximation (LSDA), Perdew–Burke–Ernzerhof (PBE) generalized gradient approximation, and the strongly constrained and appropriately normed (SCAN) meta-GGA functionals. Our results show that for the relative energies of isomers with respect to reference CCSD(T) values, the uncorrected SCAN functional has the smallest deviation of 21 meV, better than that for the MP2 method. The performance of SIC-SCAN is comparable to that of MP2 and is better than SIC-LSDA and SIC-PBE, but it reverses the ordering of the two lowest isomers for water hexamer anions. Removing self interaction error (SIE) corrects the tendency of LSDA, PBE, and SCAN to over-bind the extra electron. The vertical detachment energies (VDEs) of water cluster anions, obtained from the total energy differences of corresponding anion and neutral clusters, are significantly improved by removing self-interaction and are better than the hybrid B3LYP functional, but fall short of MP2 accuracy.more » Removing SIE results in substantial improvement in the position of the eigenvalue of the extra electron. The negative of the highest occupied eigenvalue after SIC provides an excellent approximation to the VDE, especially for SIC-PBE where the mean absolute error with respect to CCSD(T) is only 17 meV, the best among all approximations compared in this work.« less

Authors:
ORCiD logo [1];  [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [2]
  1. Univ. of Texas at El Paso, TX (United States). Dept. of Physics
  2. Univ. of Texas at El Paso, TX (United States). Dept. of Physics. Computational Science Program
  3. Central Michigan Univ., Mount Pleasant, MI (United States). Physics Dept. Science of Advanced Materials Program
Publication Date:
Research Org.:
Univ. of Texas at El Paso, TX (United States); Central Michigan Univ., Mount Pleasant, MI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1801722
Alternate Identifier(s):
OSTI ID: 1581027
Grant/Contract Number:  
SC0006818; SC0018331
Resource Type:
Accepted Manuscript
Journal Name:
Physical Chemistry Chemical Physics. PCCP
Additional Journal Information:
Journal Volume: 22; Journal Issue: 7; Journal ID: ISSN 1463-9076
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Vargas, Jorge, Ufondu, Peter, Baruah, Tunna, Yamamoto, Yoh, Jackson, Koblar A., and Zope, Rajendra R. Importance of self-interaction-error removal in density functional calculations on water cluster anions. United States: N. p., 2019. Web. doi:10.1039/c9cp06106a.
Vargas, Jorge, Ufondu, Peter, Baruah, Tunna, Yamamoto, Yoh, Jackson, Koblar A., & Zope, Rajendra R. Importance of self-interaction-error removal in density functional calculations on water cluster anions. United States. https://doi.org/10.1039/c9cp06106a
Vargas, Jorge, Ufondu, Peter, Baruah, Tunna, Yamamoto, Yoh, Jackson, Koblar A., and Zope, Rajendra R. Mon . "Importance of self-interaction-error removal in density functional calculations on water cluster anions". United States. https://doi.org/10.1039/c9cp06106a. https://www.osti.gov/servlets/purl/1801722.
@article{osti_1801722,
title = {Importance of self-interaction-error removal in density functional calculations on water cluster anions},
author = {Vargas, Jorge and Ufondu, Peter and Baruah, Tunna and Yamamoto, Yoh and Jackson, Koblar A. and Zope, Rajendra R.},
abstractNote = {Accurate description of the excess charge in water cluster anions is challenging for standard semi-local and (global) hybrid density functional approximations (DFAs). Using the recent unitary invariant implementation of the Perdew–Zunger self-interaction correction (SIC) method using Fermi-Löwdin orbitals, we assess the effect of self-interaction error on the vertical detachment energies of water cluster anions with the local spin density approximation (LSDA), Perdew–Burke–Ernzerhof (PBE) generalized gradient approximation, and the strongly constrained and appropriately normed (SCAN) meta-GGA functionals. Our results show that for the relative energies of isomers with respect to reference CCSD(T) values, the uncorrected SCAN functional has the smallest deviation of 21 meV, better than that for the MP2 method. The performance of SIC-SCAN is comparable to that of MP2 and is better than SIC-LSDA and SIC-PBE, but it reverses the ordering of the two lowest isomers for water hexamer anions. Removing self interaction error (SIE) corrects the tendency of LSDA, PBE, and SCAN to over-bind the extra electron. The vertical detachment energies (VDEs) of water cluster anions, obtained from the total energy differences of corresponding anion and neutral clusters, are significantly improved by removing self-interaction and are better than the hybrid B3LYP functional, but fall short of MP2 accuracy. Removing SIE results in substantial improvement in the position of the eigenvalue of the extra electron. The negative of the highest occupied eigenvalue after SIC provides an excellent approximation to the VDE, especially for SIC-PBE where the mean absolute error with respect to CCSD(T) is only 17 meV, the best among all approximations compared in this work.},
doi = {10.1039/c9cp06106a},
journal = {Physical Chemistry Chemical Physics. PCCP},
number = 7,
volume = 22,
place = {United States},
year = {Mon Dec 16 00:00:00 EST 2019},
month = {Mon Dec 16 00:00:00 EST 2019}
}

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Self-Interaction Correction in Water-Ion Clusters
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