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Can direct field-evaporation of doubly charged ions and post-ionisation from the singly charged state co-exist?
Authors
Th. Ganetsos Mair, A.W.R. Mair, G.L.R. Bischoff, L. Akhmadaliev, Ch. Aidinis, C.J.
Publication date
1 January 2007
Publisher
Abstract
A tin liquid metal ion source (LMIS) containing ∼14% Pb has been studied. From a careful examination of the mass spectra of the source, it is concluded that post-ionisation (PI) is the most probable mechanism for the formation of Pb2+ ions. In the case of tin, however, both Sn + and Sn2+ appear to form by direct field-evaporation. This view is supported by energy deficit measurements on the Sn+ and Sn2+ beams. Our results for Pb2+/Pb+ agree with those of Komuro with a pure Pb source. The reason for this is understandable and is related to the similarity between the evaporation fields of Sn and Pb. For the sake of completeness, we also present measurements of the energy spread of the Sn2+ and Sn+ beams. Copyright © 2007 John Wiley & Sons, Ltd
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Last time updated on 10/02/2023