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Odd-parity Rydberg and autoionizing states of thulium studied by laser resonance ionization spectroscopy
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DOI：10.1016/j.sab.2022.106376.png)
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Abstract
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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 gamma lines of the Tm isotopes at the ISAC yield station.
Keywords:
Thulium
Laser resonance ionization
Resonance ionization laser ion source
Ti
Sa laser
Rydberg state
Autoionizing state
Ionization potential
Ionization energy
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