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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/2959

Title: Investigation of the formation process of MCs+-molecular ions during sputtering
Authors: VLEKKEN, Johan
D'OLIESLAEGER, Marc
KNUYT, Gilbert
Vandervorst, W
DE SCHEPPER, Luc
Issue Date: 2000
Publisher: ELSEVIER SCIENCE INC
Citation: JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY, 11(7). p. 650-658
Abstract: In secondary ion mass spectrometry, the detection of MCs+ clusters (with M an element of the specimen) under a Cs+ bombardment is frequently used for the quantification of major elements. Despite some very good results obtained by this method, some problems still remain. In order to gain some more insight into these problems, the formation mechanism of the MCs+ clusters is investigated using a Monte Carlo model. It is shown that the majority of the constituent particles of the formed clusters are initially first or second neighbor atoms at the surface and that the velocity distribution of the MCs+ clusters becomes broader and peaked at higher velocities with increasing surface binding energy of the M atom. In addition, it is demonstrated that the interaction potential between the M and Cs+ particle has no influence on the velocity distribution of the MCs+ clusters. On the other hand, the cluster formation probability, defined as the probability that a sputtered M and Cs' particle will form a MCs+ cluster, is extremely sensitive to this interaction potential. It is also shown that the cluster formation probability decreases with increasing surface binding energy. Finally, a good correspondence is obtained between the calculated and experimental velocity distributions of MCs+ clusters sputtered from different monoatomic materials. As a consequence, the Monte Carlo model and the discussed results can be validated. IT Am Soc Mass Spectrom 2000, 11, 650-658) (C) 2000 American Society for Mass Spectrometry.
Notes: Limburgs Univ Ctr, Inst Mat Res, Div Mat Phys, B-3590 Diepenbeek, Belgium. IMEC VZW, Louvain, Belgium.Vlekken, J, Limburgs Univ Ctr, Inst Mat Res, Div Mat Phys, Univ Campus,Wetenschapspk 1, B-3590 Diepenbeek, Belgium.
URI: http://hdl.handle.net/1942/2959
ISI #: 000087783200007
ISSN: 1044-0305
Category: A1
Type: Journal Contribution
Validation: ecoom, 2001
Appears in Collections: Research publications

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