Assessing weak hydrogen binding on Ca+ centers: An accurate many-body study with large basis sets
- 28 October 2011
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 135 (16), 164105
- https://doi.org/10.1063/1.3654002
Abstract
Weak H2 physisorption energies present a significant challenge to even the best correlated theoretical many-body methods. We use the phaseless auxiliary-field quantum Monte Carlo method to accurately predict the binding energy of Ca+– 4H2. Attention has recently focused on this model chemistry to test the reliability of electronic structure methods for H2 binding on dispersed alkaline earth metal centers. A modified Cholesky decomposition is implemented to realize the Hubbard-Stratonovich transformation efficiently with large Gaussian basis sets. We employ the largest correlation-consistent Gaussian type basis sets available, up to cc-pCV5Z for Ca, to accurately extrapolate to the complete basis limit. The calculated potential energy curve exhibits binding with a double-well structure.Keywords
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Funding Information
- U.S. Department of Energy (DE-AC05-00OR22725, DE-FG05-08OR23340, DE-SC0001303)
- Office of Naval Research (N00014-08-1-1235)
- National Science Foundation (DMR-1006217)
This publication has 50 references indexed in Scilit:
- Calcium-Decorated Carbyne Networks as Hydrogen Storage MediaNano Letters, 2011
- Quantum Monte Carlo calculations of dihydrogen binding energetics on Ca cations: An assessment of errors in density functionals for weakly bonded systemsPhysical Review B, 2010
- Accuracy of density functional theory methods for weakly bonded systems: The case of dihydrogen binding on metal centersPhysical Review B, 2010
- Comment on "Inaccuracy of density functional theory calculations for dihydrogen binding energetics onto Ca cation centers".Physical Review Letters, 2010
- Inaccuracy of Density Functional Theory Calculations for Dihydrogen Binding Energetics onto Ca Cation CentersPhysical Review Letters, 2009
- Calcium-decorated carbon nanotubes for high-capacity hydrogen storage: First-principles calculationsPhysical Review B, 2009
- Ab initio design of Ca-decorated organic frameworks for high capacity molecular hydrogen storage with enhanced bindingApplied Physics Letters, 2009
- Ab initiocalculations predicting the existence of an oxidized calcium dihydrogen complex to store molecular hydrogen in densities up to 100 g/LPhysical Review B, 2009
- Optimum Conditions for Adsorptive StorageLangmuir, 2006
- Metal–dihydrogen and σ-bond coordination: the consummate extension of the Dewar–Chatt–Duncanson model for metal–olefin π bondingJournal of Organometallic Chemistry, 2001