We present an approach for obtaining a molecular orbital picture of the first dipole hyperpolarizability (β) from correlated many-body electronic structure methods. Ab initio calculations of β rely on quadratic response theory, which recasts the sum-over-all-states expression of β into a closed-form expression by calculating a handful of first- and second-order response states; for resonantly enhanced β, damped response theory is used. These response states are then used to construct second-order response reduced one-particle density matrices (1PDMs), which, upon visualization in terms of natural orbitals (NOs), facilitate a rigorous and black-box mapping of the underlying electronic structure with β. We explain the interpretation of different components of the response 1PDMs and the corresponding NOs within both the undamped and damped response theory framework. We illustrate the utility of this new tool by deconstructing β for cis-difluoroethene, para-nitroaniline, and hemibonded OH· + H2O complex, computed within the framework of coupled-cluster singles and doubles response theory, in terms of the underlying response 1PDMs and NOs for a range of frequencies.
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14 May 2021
Research Article|
May 13 2021
The orbital picture of the first dipole hyperpolarizability from many-body response theory
Kaushik D. Nanda
;
Kaushik D. Nanda
a)
Department of Chemistry, University of Southern California
, Los Angeles, California 90089-0482, USA
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Anna I. Krylov
Anna I. Krylov
a)
Department of Chemistry, University of Southern California
, Los Angeles, California 90089-0482, USA
Search for other works by this author on:
J. Chem. Phys. 154, 184109 (2021)
Article history
Received:
March 02 2021
Accepted:
April 21 2021
Citation
Kaushik D. Nanda, Anna I. Krylov; The orbital picture of the first dipole hyperpolarizability from many-body response theory. J. Chem. Phys. 14 May 2021; 154 (18): 184109. https://doi.org/10.1063/5.0049184
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