Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Singlet-paired coupled cluster theory for open shells

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4954891· OSTI ID:1467828
 [1];  [2];  [2]
  1. Rice Univ., Houston, TX (United States). Dept. of Chemistry; Rice University
  2. Rice Univ., Houston, TX (United States). Dept. of Chemistry and Dept. of Physics and Astronomy
Restricted single-reference coupled cluster theory truncated to single and double excitations accurately describes weakly correlated systems, but often breaks down in the presence of static or strong correlation. Good coupled cluster energies in the presence of degeneracies can be obtained by using a symmetry-broken reference, such as unrestricted Hartree-Fock, but at the cost of good quantum numbers. A large body of work has shown that modifying the coupled cluster ansatz allows for the treatment of strong correlation within a single-reference, symmetry-adapted framework. The recently introduced singlet-paired coupled cluster doubles (CCD0) method is one such model, which recovers correct behavior for strong correlation without requiring symmetry breaking in the reference. In this, we extend singlet-paired coupled cluster for application to open shells via restricted open-shell singlet-paired coupled cluster singles and doubles (ROCCSD0). The ROCCSD0 approach retains the benefits of standard coupled cluster theory and recovers correct behavior for strongly correlated, open-shell systems using a spin-preserving ROHF reference.
Research Organization:
Rice Univ., Houston, TX (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Welch Foundation
Grant/Contract Number:
FG02-04ER15523
OSTI ID:
1467828
Alternate ID(s):
OSTI ID: 22675979
OSTI ID: 1259983
Journal Information:
Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 24 Vol. 144; ISSN JCPSA6; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

References (38)

The role of databases in support of computational chemistry calculations journal October 1996
An Introduction to Coupled Cluster Theory for Computational Chemists book January 2000
A Critical Assessment of Coupled Cluster Method in Quantum Chemistry book January 1999
Ionization energies of water from PNO-CI calculations journal January 1971
Application of graphical methods of spin algebras to limitedCI approaches. I. Closed shell case journal May 1977
Coupled cluster approaches with an approximate account of triexcitations and the optimized inner projection technique: I. General orthogonally spin-adapted formalism journal January 1990
The open-shell restricted Hartree—Fock singles and doubles coupled-cluster method including triple excitations CCSD (T): application to C+3 journal January 1991
Can ordinary single-reference coupled-cluster methods describe the potential energy curve of N2? The renormalized CCSDT(Q) study journal August 2001
Many – Body Methods in Chemistry and Physics book January 2009
Can Single-Reference Coupled Cluster Theory Describe Static Correlation? journal June 2015
Basis Set Exchange:  A Community Database for Computational Sciences journal March 2007
Multireference Nature of Chemistry: The Coupled-Cluster View journal December 2011
A New Mean-Field Method Suitable for Strongly Correlated Electrons: Computationally Facile Antisymmetric Products of Nonorthogonal Geminals journal February 2013
Assessing the Accuracy of New Geminal-Based Approaches journal April 2014
Self‐Consistent Molecular Orbital Methods. IV. Use of Gaussian Expansions of Slater‐Type Orbitals. Extension to Second‐Row Molecules journal March 1970
Addition by subtraction in coupled-cluster theory: A reconsideration of the CC and CI interface and the nCC hierarchy journal November 2006
Efficient and accurate local approximations to coupled-electron pair approaches: An attempt to revive the pair natural orbital method journal March 2009
pCCSD: Parameterized coupled-cluster theory with single and double excitations journal November 2010
Correlation problems in atomic and molecular systems. V. Spin‐adapted coupled cluster many‐electron theory journal July 1977
An efficient reformulation of the closed‐shell coupled cluster single and double excitation (CCSD) equations journal December 1988
Gaussian basis sets for use in correlated molecular calculations. I. The atoms boron through neon and hydrogen journal January 1989
A fusion of the closed-shell coupled cluster singles and doubles method and valence-bond theory for bond breaking journal September 2012
Communication: The distinguishable cluster approximation journal July 2013
Seniority zero pair coupled cluster doubles theory journal June 2014
Communication: The distinguishable cluster approximation. II. The role of orbital relaxation journal August 2014
Seniority-based coupled cluster theory journal December 2014
Accurate thermochemistry from explicitly correlated distinguishable cluster approximation journal February 2015
Pair extended coupled cluster doubles journal June 2015
Actinide chemistry using singlet-paired coupled cluster and its combinations with density functionals journal December 2015
Assessing the distinguishable cluster approximation based on the triple bond-breaking in the nitrogen molecule journal March 2016
The influence of orbital rotation on the energy of closed-shell wavefunctions journal January 2014
Combinations of coupled cluster, density functionals, and the random phase approximation for describing static and dynamic correlation, and van der Waals interactions journal November 2015
Approximate account of the connected quadruply excited clusters in the coupled-pair many-electron theory journal November 1984
Approximate account of connected quadruply excited clusters in single-reference coupled-cluster theory via cluster analysis of the projected unrestricted Hartree-Fock wave function journal August 1996
Efficient description of strongly correlated electrons with mean-field cost journal May 2014
Polynomial similarity transformation theory: A smooth interpolation between coupled cluster doubles and projected BCS applied to the reduced BCS Hamiltonian journal March 2016
Coupled-cluster theory in quantum chemistry journal February 2007
Numerical Linear Algebra book January 1997

Cited By (5)


Similar Records

Singlet-paired coupled cluster theory for open shells
Journal Article · Tue Jun 28 00:00:00 EDT 2016 · Journal of Chemical Physics · OSTI ID:22675979

Recoupling the singlet- and triplet-pairing channels in single-reference coupled cluster theory
Journal Article · Mon Oct 03 20:00:00 EDT 2016 · Journal of Chemical Physics · OSTI ID:1465478

Assessment of the accuracy of coupled cluster perturbation theory for open-shell systems. I. Triples expansions
Journal Article · Sat May 21 00:00:00 EDT 2016 · Journal of Chemical Physics · OSTI ID:22658005