Orbit-orbit relativistic correction calculated with all-electron molecular explicitly correlated Gaussians.

J Chem Phys

Department of Chemistry and Biochemistry and Department of Physics, University of Arizona, Tucson, Arizona 85721, USA andInterdisciplinary Center for Modern Technologies, Nicolaus Copernicus University, ul. Wileńska 4, Toruń PL 87-100, Poland.

Published: December 2016

An algorithm for calculating the first-order electronic orbit-orbit magnetic interaction correction for an electronic wave function expanded in terms of all-electron explicitly correlated molecular Gaussian (ECG) functions with shifted centers is derived and implemented. The algorithm is tested in calculations concerning the H molecule. It is also applied in calculations for LiH and H molecular systems. The implementation completes our work on the leading relativistic correction for ECGs and paves the way for very accurate ECG calculations of ground and excited potential energy surfaces (PESs) of small molecules with two and more nuclei and two and more electrons, such as HeH, H, HeH, and LiH. The PESs will be used to determine rovibrational spectra of the systems.

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Source
http://dx.doi.org/10.1063/1.4971376DOI Listing

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