6533b82dfe1ef96bd12913ae
RESEARCH PRODUCT
Ground and Excited State First-Order Properties in Many-Body Expanded Full Configuration Interaction Theory
Jürgen GaussJanus J. Eriksensubject
PhysicsChemical Physics (physics.chem-ph)010304 chemical physicsElectronic correlationBasis (linear algebra)General Physics and AstronomyFOS: Physical sciences010402 general chemistry01 natural sciencesFull configuration interaction0104 chemical sciencesDipoleQuality (physics)Physics - Chemical PhysicsQuantum mechanicsExcited state0103 physical sciencesPhysical and Theoretical ChemistryWave functionGround statedescription
The recently proposed many-body expanded full configuration interaction (MBE-FCI) method is extended to excited states and static first-order properties different from total, ground state correlation energies. Results are presented for excitation energies and (transition) dipole moments of two prototypical, heteronuclear diatomics---LiH and MgO---in augmented correlation consistent basis sets of up to quadruple-$\zeta$ quality. Given that MBE-FCI properties are evaluated without recourse to a sampled wave function and the storage of corresponding reduced density matrices, the memory overhead associated with the calculation of general first-order properties only scales with the dimension of the desired property. In combination with the demonstrated performance, the present developments are bound to admit a wide range of future applications by means of many-body expanded treatments of electron correlation.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-08-08 |