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In-source resonance ionization spectroscopy was used to identify an efficientand selective three step excitation/ionization scheme of thorium, suitable fortitanium:sapphire (Ti:sa) lasers. The measurements were carried out inpreparation of laser spectroscopic investigations for an identification of thelow-lying Th-229m isomer predicted at 7.6 +- 0.5 eV above the nuclear groundstate. Using a sample of Th-232, a multitude of optical transitions leading toover 20 previously unknown intermediate states of even parity as well asnumerous high-lying odd parity auto-ionizing states were identified. Levelenergies were determined with an accuracy of 0.06 cm-1 for intermediate and0.15 cm-1 for auto-ionizing states. Using different excitation pathways anassignment of total angular momenta for several energy levels was possible. Oneparticularly efficient ionization scheme of thorium, exhibiting saturation inall three optical transitions, was studied in detail. For all three levels inthis scheme, the isotope shifts of the isotopes Th-228, Th-229, and Th-230relative to Th-232 were measured. An overall efficiency including ionization,transport and detection of 0.6 was determined, which was predominantly limitedby the transmission of the mass spectrometer ion optics.

Resonance ionization spectroscopy of thorium isotopes - towards a laser spectroscopic identification of the low-lying 7.6 eV isomer of Th-229