Theory paper on electron bridge excitation of the isomer

The direct excitation of the nuclear isomeric state is hindered by (1) the technological challenge of building a narrow-linewidth, coherent laser source, and (2) the small coupling of the nucleus to the laser field. These two limitations can be overcome by using an electron bridge process, in which at least part of the required excitation energy is provided by the excitation of a suitable long-lived electronic state. This approach is followed by the ion trap group of E. Peik at PTB. In recent theory work, the group of A. Palffy at MPIK Heidelberg investigated a suitable scheme using Th3+ ions. The manuscript is now available here on the arXiv.