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The parameter $W_\mathrm{a}$, which characterizes nuclear spin-dependentparity violation effects within the effective molecular spin-rotationalHamiltonian, was computed for the electronic ground state of radium fluoride(RaF) and found to be one of the largest absolute values predicted so far.These calculations were performed with the complex generalised Hartree-Fockmethod within a two-component (quasi-relativistic) zeroth-order regularapproximation framework. Peculiarities of the molecular electronic structure ofRaF lead to highly diagonal Franck-Condon matrices between vibrational statesof the electronic ground and first excited states, which renders the moleculein principle suitable for direct laser cooling. As a trapped gas of coldmolecules offers a superior coherence time, RaF can be considered a promisingcandidate for high-precision spectroscopic experiments aimed at the search ofmolecular parity-violation effects.

Lasercooled RaF as a promising candidate to measure molecular parity violation