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Rostock 2019 – scientific programme

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MS: Fachverband Massenspektrometrie

MS 7: New Developments and Techniques

MS 7.3: Talk

Wednesday, March 13, 2019, 15:30–15:45, U A-Esch 2

Studies of lanthanide desorption enthalpies and filament work functions for laser spectroscopic investigations of the heaviest actinides — •Tobias Murböck1,2, Brankica Andelić1,3, Michael Block1,2,4, Premaditya Chhetri5, Julia Even3, Francesca Giacoppo2, Oliver Kaleja2,4,6, Tobias Kron1,2, Mustapha Laatiaoui4, Andrew Mistry1,2, Steven Nothhelfer4, Sebastian Raeder2, Elisabeth Rickert4, and Fabian Schneider41HI Mainz — 2GSI — 3KVI-CART, RU Groningen — 4Uni Mainz — 5TU Darmstadt — 6MPIK Heidelberg

To probe the atomic shell structure of the heaviest actinides with Z > 100, the sensitive RAdiation Detected Resonance Ionization Spectroscopy (RADRIS) technique is applied at the SHIP velocity filter at GSI. After production in high-energy fusion-evaporation reactions the recoil products are stopped in a buffer-gas cell and collected onto a filament. Subsequent thermal evaporation as neutral atoms allows the atomic structure to be probed using laser spectroscopy. The desorption enthalpy of these elements and the filament work function are crucial for determining the efficiency of the evaporation and the background created by surface ions, respectively. In this talk, a setup for mass spectrometry of surface ionized and laser ionized lanthanides evaporated from different sample filaments is presented. The desorption enthalpies of ytterbium and lutetium from a larger variety of surfaces are discussed with regard to the prospects of laser-spectroscopic investigations of their heavier homologes, nobelium (Z = 102) and lawrencium (Z = 103).

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