Toolbox approach for quasi-relativistic calculation of molecular properties for precision tests of fundamental physics

Abstract

A generally applicable approach for the calculation of relativistic one-electron properties with two-component wave functions is presented. The formalism is explicitly evaluated for the example of quasi-relativistic wavefunctions obtained within the zeroth order regular approximation (ZORA). The wide applicability of the scheme is demonstrated for the calculation of parity ($\mathcal{P}$) and time-reversal ($\mathcal{T}$) symmetry violating properties, which are important for searches of physics beyond the standard model of particle physics. The quality of the ZORA results is shown exemplarily for the molecules RaF and TlF by comparison to data from four-component calculations as far as available. Finally, the applicability of RaF in experiments that search for $\mathcal{P},\mathcal{T}$-violation not only in the electronic but also in quark sector is demonstrated.

arXiv comment11 pages, 3 tables

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• Pinning down electron correlations in RaF via spectroscopy of excited states and high-accuracy relativistic quantum chemistry
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• Ab initio study and assignment of electronic states in molecular RaCl
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