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Selective laser photodetachment of intense atomic and molecular negative ion beams with the ILIAS RFQ ion beam cooler

Artikel i vetenskaplig tidskrift
Författare M. Martschini
J. Pitters
T. Moreau
P. Andersson
O. Forstner
Dag Hanstorp
J. Lachner
Y. Liu
A. Priller
P. Steier
R. Golser
Publicerad i International Journal of Mass Spectrometry
Volym 415
Sidor 9-17
ISSN 1387-3806
Publiceringsår 2017
Publicerad vid Institutionen för fysik (GU)
Sidor 9-17
Språk en
Länkar 10.1016/j.ijms.2016.12.015
Ämnesord AMS, Ion beam cooling, Selective laser photodetachment, Optical filtering, Negative ions, electron detachment, isobar suppression, low-energy, ams, quadrupole, collisions, separation, cl-36, vera, ampion rl, 1982, advances in electronics and electron physics, v58, p143, nison dr, 1971, journal of vacuum science & technology, v8, p266
Ämneskategorier Fysik

Sammanfattning

The Ion Laser InterAction Setup (ILIAS) project at the University of Vienna aims at the exploration of negative ion beam filtering by selective laser photodetachment for applications in accelerator mass spectrometry (AMS). A gas-filled radio frequency quadrupole (RFQ) is used to decelerate and cool negative atomic and molecular ion beams with intensities of up to several-hundred nA, and overlap them collinearly with a continuous wave (cw) laser beam. Ion-laser interaction times ranging from 500 mu s to several ms allow for highly efficient, selective photodetachment depletion of disturbing ion species within these beams. The elemental selectivity of this technique is based on the differences in electron affinities, and therefore does not depend on relative differences in atomic numbers. It may therefore provide sufficient isobar suppression for new trace isotopes, which are not accessible with existing AMS techniques. The ILIAS RFQ cooler was characterized at a purpose-built test bench with respect to ion beam transmission, ion cooling capabilities and ion residence times as a function of injected ion current to assess its suitability for future AMS use. A Cu-63(-) test beam of 600 nA was photodetached with more than 99.999% efficiency with a 532 nm laser at 10.8 W power. At the same time, ions of interest having electron affinities higher than the photon energy passed the cooler unaffected. Total ion losses were thus found to be below 50% of the sputter source output. Finally, first photodetachment experiments in connection with Al-26 detection demonstrated selective isobar suppression of MgO- vs. AlO- by more than 4 orders of magnitude. Currently, the RFQ cooler is moved to a new injector beamline at the Vienna Environmental Research Accelerator (VERA) for first applications of this novel technique at a state-of-the-art AMS facility. (C) 2016 Elsevier B.V. All rights reserved.

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