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Light induced suppression of sulfur in a cesium sputter ion source

Författare och institution:
Martin Martschini (-); Johan Rohlén (Institutionen för fysik (GU)); Pontus Andersson (-); Robin Golser (-); Dag Hanstorp (Institutionen för fysik (GU)); Anton Lindahl (Institutionen för fysik (GU)); Alfred Priller (-); Peter Steier (-); Oliver Forstner (-)
Publicerad i:
International Journal of Mass Spectrometry, 315 s. 55-59
ISSN:
1387-3806
Publikationstyp:
Artikel, refereegranskad vetenskaplig
Publiceringsår:
2012
Språk:
engelska
Fulltextlänk:
Sammanfattning (abstract):
New techniques for suppression of atomic isobars in negative ion beams are of great interest for accelerator mass spectrometry (AMS). Especially small and medium-sized facilities can significantly extend their measurement capabilities to new interesting isotopes with a technique independent of terminal voltage. In a new approach, the effect of continuous wave laser light directed towards the cathode surface in a cesium sputter ion source of the Middleton type was studied. The laser light induced a significant change in oxygen, sulfur and chlorine negative ion production from a AgCl target. Approximately 100 mW of laser light reduced the sulfur to chlorine ratio by one order of magnitude. The effect was found to depend on laser power and ion source parameters but not on the laser wavelength. The time constant of the effect varied from a few seconds up to several minutes. Experiments were first performed at the ion beam facility GUNILLA at University of Gothenburg with macroscopic amounts of sulfur. The results were then reproduced at the VERA AMS facility with chemically cleaned AgCl targets containing ∼1 ppm sulfur. The physical explanation behind the effect is still unclear. Nevertheless, the technique has been successfully applied during a regular AMS measurement of 36Cl.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
NATURVETENSKAP ->
Fysik ->
Atom- och molekylfysik och optik ->
Atomfysik
Postens nummer:
235915
Posten skapad:
2016-05-04 11:30

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