Precision resonance ionization spectroscopy in a hypersonic gas jet yields the first ionization potential of thorium at 6.306879(14) eV and the second at 12.300(9) eV, using a new Rydberg-series field-ionization technique.
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Study of thorium in hypersonic gas jets: Ionization potentials of Th and Th$^+$
Precision resonance ionization spectroscopy in a hypersonic gas jet yields the first ionization potential of thorium at 6.306879(14) eV and the second at 12.300(9) eV, using a new Rydberg-series field-ionization technique.