Köln 2025 – scientific programme

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MS: Fachverband Massenspektrometrie

MS 6: Isobar Suppression Techniques

MS 6.2: Talk

Thursday, March 13, 2025, 11:30–11:45, HS 2 Chemie

Investigations on ILIAMS isobar suppression for non-routine AMS isotopes — •Martin Martschini¹, Denis Ibrahimovic¹, David Krebs¹, Oscar Marchhart¹, Silke Merchel¹, Thorben Niemeyer², Raphael Haase², Klaus Wendt², and Karin Hain¹ — ¹University of Vienna, Faculty of Physics - Isotope Physics, Austria — ²Johannes Gutenberg-University, Mainz, Germany

The Ion-Laser InterAction Mass Spectrometry (ILIAMS) setup at Vienna offers unique opportunities for atomic isobar suppression in AMS via element-selective laser photodetachment. Over the past years, several studies on the ILIAMS performance for rather exotic AMS isotopes like ³²Si, ⁴⁴Ti, ⁵⁹Ni, ⁶⁰Fe, and ¹⁰⁷Pd (t_1/2 = 60 – 7×10⁶ yr) were carried out, fueled by interest in these isotopes from nuclear astrophysics and environmental sciences. First, screening campaigns of oxide and fluoride molecular anions to identify systems suited for suppression of S, Ca, Co, Ni and Ag, respectively, were conducted using our fixed-frequency lasers of typically 10 – 20 W output power. Subsequently, negative ion yields of several of these anions in a Cs-sputter ion source were investigated. Additionally, measurement campaigns with tunable Ti:Sa and OPO lasers have recently been started to pin down unknown detachment energies of further promising systems. This work was partly supported by ChETEC-INFRA (EU H2020 #101008324).

Keywords: ILIAMS; AMS; isobar suppression; laser photodetachment; negative ions