Work

Quantification of the basis set error for molecules in strong magnetic fields and general orientation

Year: 2025

Type: article

Abstract: The paper investigates the basis set incompleteness errors of the Hartree-Fock energies for molecules in extreme magnetic field strengths up to 5 B0 (≈106 T), considering electronic state, geometric structure, and orientation of the molecule with respect to the magnetic field. We compare the results from finite-field calculations using uncontracted correlation-consistent basis sets with the fully numerical solution using multiresolution analysis on the He atom and its dimer, as well as the methylidyne radical and the water molecule. Standard uncontracted aug-cc-pVQZ basis sets are generally reliable up to B = 0.2 B0. Between B = 0.5 B0 and 1.0 B0, care must be taken as the ground state switches to states with high multiplicities, for which standard basis sets have not been optimized. Beyond B = 1.0 B0, the angular and state dependence of these basis sets becomes too large and too unsystematic for results to be considered reliable.

Source: The Journal of Chemical Physics

DOI: 10.1063/5.0274736

Authors: Raunak Farhaz, Florian A. Bischoff, Simon Blaschke, Stella Stopkowicz

Institutions: Humboldt-Universität zu Berlin, Johannes Gutenberg University Mainz, Saarland University, University of Oslo

Language: English

Topic: Advanced Chemical Physics Studies

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,500

Funders: Deutscher Akademischer Austauschdienst, Deutsche Forschungsgemeinschaft