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Using resonant two-step laser excitation of trapped $^{232}\mathrm{Th}^+$ions, we observe 166 previously unknown energy levels of even parity within theenergy range from 7.8 to 9.8 eV and angular momenta from $J=1/2$ to $7/2$. Wealso classify the high-lying levels observed in our earlier experiments by thetotal angular momentum and perform ab-initio calculations to compare theirresults with the observed level density. The observed levels can be relevantfor the excitation or decay of the $^{229m}\mathrm{Th}$ isomeric nuclear statewhich lies in this energy range. The high density of electronic levels promisesa strongly enhanced electronic bridge excitation of the isomer in$^{229}\mathrm{Th}^+$.

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