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

Martschini, M. (författare)
Pitters, J. (författare)
Moreau, T. (författare)
visa fler...
Andersson, P. (författare)
Forstner, O. (författare)
Hanstorp, Dag, 1960 (författare)
Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
Lachner, J. (författare)
Liu, Y. (författare)
Priller, A. (författare)
Steier, P. (författare)
Golser, R. (författare)
visa färre...
 (creator_code:org_t)
Elsevier BV, 2017
2017
Engelska.
Ingår i: International Journal of Mass Spectrometry. - : Elsevier BV. - 1387-3806. ; 415, s. 9-17
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • 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.

Ämnesord

NATURVETENSKAP  -- Fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Nyckelord

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

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