High efficiency resonance ionization of thorium

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:462

Article

Liu, Y.¹  Stracener, D. W.¹ 

[1] Oak Ridge Natl Lab, Div Phys, POB 2009, Oak Ridge, TN 37831 USA

关键词: Thorium;    Resonance ionization;    Mass spectrometry;    Ti:Sapphire laser;    Ionization efficiency;   

DOI  :  10.1016/j.nimb.2019.11.006

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

Free