We observe a hyperfine anomaly in the measurement of the hyperfine splitting of the 6S1/2 excited level in rubidium. We perform two step spectroscopy using the 5S1/2 → 5P1/2 → 6S1/2 excitation sequence. We measure the splitting of the 6S1/2 level and obtain for the magnetic dipole constants of Rb and Rb A = 239.18(4) MHz and A = 807.66(8) MHz, respectively. The hyperfine anomaly difference of 8...

Q-band and X-band pulsed electron paramagnetic resonance spectroscopic methods (EPR) in the solid state were employed to refine the parameters characterizing the anisotropic interactions present in six nitroxide radicals prepared by N,N addition of NO to various borane-phosphane frustrated Lewis pairs (FLPs). The EPR spectra are characterized by the g-anisotropy as well as by nuclear hyperfine ...

Investigations of the hyperfine splitting and the g factor in highly charged ions give an access to a test of boundstate QED in strongest electromagnetic fields available at present for experimental study. To date, accurate measurements of the ground-state hyperfine structure and of the g factor were performed in H-like ions. An extention of such kind of experiments to highly charged Li-like io...

In the interaction of two electric quadrupoles, there is at short range a contact term proportional to the second derivative of a delta function. This contact term contributes to the hyperfine splitting of bound states of two particles with spin one or higher-for example the bound state of Ω − and a nucleus with spin one. The contact hyperfine splitting occurs in states with orbital angular mom...