Related Experiment Video
Updated: May 7, 2026

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
Published on: April 8, 2020
Optimization of RI-MP2 auxiliary basis functions for 6-31G** and 6-311G** basis sets for first-, second-, and
Masato Tanaka1, Michio Katouda, Shigeru Nagase
1Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, Kagamiyama, Higashi-Hiroshima, 739-8526, Japan.
Abstract:
Auxiliary basis functions for second-order Møller-Plesset perturbation theory with resolution-of-identity approximation (RI-MP2) are developed for first-, second-, and third-row elements, which are suitable for Pople-type 6-31G** and 6-311G** basis sets. Atomic-centered Gaussian functions up to the g-type function are used for auxiliary basis functions to obtain higher accuracy for molecules with the accurate description of bonding properties. The performance of the developed auxiliary basis functions were tested and evaluated for 114 small and 23 large molecules. The developed auxiliary basis functions show much smaller energy differences between MP2 and RI-MP2 than other auxiliary basis functions used for 6-31G** and 6-311G** basis sets with similar computational costs.
More Related Videos
Related Concept Videos
Atomic Radii and Effective Nuclear Charge
Methods of Medium Optimization
Law of Rational Indices
¹H NMR: Complex Splitting
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
Hybridization of Atomic Orbitals II
Electronic Structure of Atoms
An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum numbers: n, l, ml, and...

