Hannover 2020 – scientific programme
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A: Fachverband Atomphysik
A 7: Precision spectroscopy of atoms and ions I
A 7.2: Talk
Monday, March 9, 2020, 14:30–14:45, f107
Resonance ionization mass spectrometry on 243−248Cm — •Nina Kneip1, Christoph E. Düllmann2,3,4, Christian M. Marquardt5, Christoph Mokry2,4, Petra J. Panak5,6, Sebastian Raeder3, Jörg Runke2,3, Petra Thörle-Pospiech2,4, Felix Weber1, Klaus Wendt1, and Norbert Trautmann2 — 1Institute of Physics, Johannes Gutenberg University Mainz — 2Institute of Nuclear Chemistry, Johannes Gutenberg University Mainz — 3GSI Helmholtz Centre for Heavy Ion Research mbH, Darmstadt — 4Helmholtz Institute Mainz — 5Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology, Karlsruhe — 6Institute of Physical Chemistry, Heidelberg University
In numerous applications resonance ionization mass spectroscopy has demonstrated its versatility as a highly efficient and selective method for the ultra-trace determination of actinides. The RISIKO facility involves a 30 kV magnetic sector field mass separator in combination with a laser ion source and a high repetition rate pulsed Ti:sapphire laser system. Optical spectroscopy on a number of curium isotopes was performed using sample sizes of typically 109 atoms. The individual tunable lasers involve automated grating-tuning and Intra-Cavity Second Harmonic Generation. Efficient two-step ionization schemes for Cm were identified and scans across Rydberg series were performed using two different first excitation steps. With a Cm sample containing the isotopes 243 to 248 isotope shifts were measured for the first time of all these isotopes and the ionization potential was deduced with significantly enhanced precision using the Rydberg Ritz formula.