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Analytic Evaluation of Energy First Derivatives for Cholesky Decomposition-Based Relativistic Two-Component
Chaoqun Zhang1, Tianxiang Chen2, Lan Cheng2
1Department of Chemistry, Yale University, New Haven, Connecticut 06511, United States.
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Analytic evaluation of first-order properties for the Cholesky decomposition (CD)-based relativistic two-component coupled-cluster singles and doubles (CCSD) and equation-of-motion CCSD (EOM-CCSD) methods is reported. The CD-based implementation significantly improves the efficiency in handling two-electron integrals involving frozen orbitals and reduces the storage requirement for the two-electron density matrices in analytic derivative calculations. Benchmark calculations of dipole moments, electric field gradients, and molecular sensitivity factors for nuclear Schiff moments show that a modest Cholesky threshold of 10-4 provides accurate results. Calculations for Mössbauer spectroscopy parameters of gold-containing complexes are reported to demonstrate the applicability of the present implementation to medium-sized molecules containing heavy atoms.
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