Publikationen

The ILIAS project for selective isobar suppression by laser photodetachment

Autor(en)
Oliver Forstner, Pontus Andersson, Dag Hanstorp, Johannes Lahner, Martin Martschini, Johanna Pitters, Alfred Priller, Peter Steier, Robin Golser
Abstrakt

Laser photodetachment is the process when the extra electron of a negative ion is removed by means of laser radiation. This can happen only if the photon energy is larger than the electron affinity of the ion. The process can be used in mass spectrometry to selectively suppress unwanted isobars, provided that the electron affinity of the unwanted isobar is lower than that of the isobar under investigation. At the Ion Laser InterAction Setup (ILIAS) at the University of Vienna laser photodetachment of negative atomic and molecular ions is studied and its applicability for selective isobar suppression in accelerator mass spectrometry (AMS) is evaluated. The setup provides mass separated beams of negative ions with energies up to 30 keV. Negative ions are produced in a Middleton type cesium sputter ion source, mass selected and overlapped with a strong continuous wave laser beam. In order to extend the interaction time of ions and laser, the ion beam is decelerated to thermal energies in a gas-filled radio frequency quadrupole cooler. For an appropriate choice of the photon energy, unwanted isobars are neutralized while the isobar of interest is unaffected and remains negatively charged. A description of the ILIAS setup and results from the commissioning phase of the RFQ cooler are presented. Up to 8% ion beam transmission could be achieved after a recent redesign of the extraction system. Furthermore first results of photodetachment experiments of

63Cu

- within the RFQ cooler are presented.

Organisation(en)
Isotopenphysik
Externe Organisation(en)
Österreichische Akademie der Wissenschaften (ÖAW), Chalmers University of Technology, University of Gothenburg, Universität Wien
Journal
Nuclear Instruments & Methods in Physics Research. Section B. Beam Interactions with Materials and Atoms
Band
361
Seiten
217-221
Anzahl der Seiten
5
ISSN
0168-583X
DOI
https://doi.org/10.1016/j.nimb.2015.04.021
Publikationsdatum
10-2015
Peer-reviewed
Ja
ÖFOS 2012
103014 Kernphysik
Schlagwörter
ASJC Scopus Sachgebiete
Nuclear and High Energy Physics, Instrumentation
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/the-ilias-project-for-selective-isobar-suppression-by-laser-photodetachment(d0926bc3-c2a8-4d50-9760-18d398de92cf).html