Journal
ACCOUNTS OF CHEMICAL RESEARCH
Volume 39, Issue 3, Pages 207-215Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ar050029d
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For 50 years, progress toward the direct calculation of the ground-state two-electron reduced density matrix (2-RDM) was stymied from an inability to constrain the 2-RDM to represent an N-electron wave function. Recent advances in theory and optimization have realized the direct calculation of the 2-RDM. A variational 2-RDM procedure, using first-order semidefinite programming, has been shown to capture multireference correlation effects important at nonequilibrium geometries [Mazziotti, Phys. Rev. Lett. 2004, 93, No. 213001]. This method emerged from research on a nonvariational calculation of the 2-RDM by the contracted Schrodinger equation. Both approaches will be discussed and illustrated.
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