Unexpectedly large difference of the electron density at the nucleus in the 4p ${}^2$P${}_{1/2,3/2}$ fine-structure doublet of Ca${}^{+}$

C. Shi, F. Gebert, C. Gorges +9

We measured the isotope shift in the ${}^2$S${}_{1/2}$-${}^2$P${}_{3/2}$ (D2) transition in singly-ionized calcium ions using photon recoil spectroscopy. The high accuracy of the technique…