Abstract
Laser resonance ionization spectroscopy of atomic thulium (Tm) has been performed at TRIUMF's off-line laser ion source test stand with a system of pulsed titanium sapphire (Ti:Sa) lasers. Automated continuous laser frequency scans across Rydberg states and autoionizing (AI) states were carried out using a pulsed, frequency doubled grating-tuned Ti:Sa laser. A combined analysis of the convergence limits resulting from odd-parity Rydberg series and AI Rydberg series improved the value for the ionization potential to 49,880.57(6)stat(4)sys cm−1, one order of magnitude more precise than the currently accepted value of 49,879.8(5) cm−1. An efficient resonance ionization scheme has been deduced from the photoionization spectra, and applied to online radioactive Tm isotope beam delivery at ISAC-TRIUMF. The ionization scheme will be useful for the extraction of Tm isotopes for nuclear medicine. The production yields of 153–165Tm were measured by evaluating the characteristic γ lines of the Tm isotopes at the ISAC yield station.
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