Electronic level structure of ${\mathrm{Th}}^{+}$ in the range of the ${}^{229m}\mathrm{Th}$ isomer energy

David-Marcel Meier, Johannes Thielking, Przemysław Głowacki +4

Using resonant two-step laser excitation of trapped ${}^{232}{\mathrm{Th}}^{+}$ ions, we observe 166 previously unknown energy levels of even parity within the energy range from 7.8 to 9…