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On the First-Order Correction for One-Body Properties in Uncontracted Multireference Perturbation Theory Framework
Georgii A Akimov1, Ilya O Glebov1
1Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia.
Abstract:
The first-order correction for the one-body electronic properties can be a powerful tool for increasing the accuracy of their calculations in the framework of multireference perturbation theory (MRPT) methods. The individual contributions for the evaluation of the one-body properties are derived for the fully uncontracted MRPT. A detailed algorithm for their simple and cost-effective calculation is also presented. A way to construct a sum of zeroth- and first-order contributions in operator form is demonstrated. Results obtained in the framework of uncontracted MRPT CDAS-PT2(IPEA) implemented in the NOPT quantum chemistry package for test cases of several small molecules show the improvement of the precision of the calculation for the permanent and transition dipole moment.
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