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The ILIAMS project - An RFQ ion beam cooler for selective laser photodetachment at VERA

Journal article
Authors M. Martschini
Dag Hanstorp
J. Lochner
C. Marek
A. Priller
P. Steier
P. Wasserburger
R. Golser
Published in Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms
Volume 456
Pages 213-217
ISSN 0168-583X
Publication year 2019
Published at Department of Physics (GU)
Pages 213-217
Language en
Keywords AMS, Ion beam cooling, Selective laser photodetachment, Negative ions, Isobar suppression, accelerator mass-spectrometry, isobar suppression, negative-ions, Instruments & Instrumentation, Nuclear Science & Technology, Physics
Subject categories Atom and Molecular Physics and Optics


Selective laser photodetachment of anions is a novel technique for isobar suppression in Accelerator Mass Spectrometry (AMS). Ion-laser interaction times on the order of ms required for near-complete isobar suppression are achieved by retarding the ions in a gas-filled radio frequency quadrupole cooler. Inside this RFQ, the cooled anion beam is overlapped collinearly with an intense cw-laser beam. Within the Ion Laser InterAction Mass Spectrometry (ILIAMS) project at the University of Vienna, a dedicated injector beamline has been coupled to the VERA-AMS facility to explore and develop this method. In this work, experimental investigations on ion beam transmission, stability and elemental selectivity of the new setup are presented. A 532 nm laser at 10 W transmitted power provides suppression factors larger than ten orders of magnitude for S- and MgO- under AMS conditions with simultaneous beam transmission for the ions of interest of up to 80%. The excellent ion identification capabilities of the subsequent AMS system also facilitate the study of destruction and formation of molecular anions inside the ion cooler. These kinetic and chemical reactions with the buffer gas provide additional elemental selectivity in certain cases, whereas others constitute a source of background.

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