High efficiency resonance ionization of thorium
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS(2020)
Abstract
Multi-step resonance ionization spectroscopy of thorium has been performed with Ti:Sapphire lasers and a hotcavity laser ion source. Resonance ionization schemes involving three-color, three-photon ionization processes are evaluated and a new three-photon scheme is demonstrated with measured overall ionization efficiency of 38.6(5)%. This high efficiency makes it possible to determine the thorium impurities in materials used for ultralow background neutrino detectors and could also benefit ultra-trace thorium analysis using resonance ionization mass spectrometry for various radiochemical tracer applications.
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Key words
Thorium,Resonance ionization,Mass spectrometry,Ti:Sapphire laser,Ionization efficiency
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