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Observation of Small Multiply Charged Clusters in a Laser-produced Plasma

✍ Scribed by P. M. Devlin-Hill; H.T. Miles

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
311 KB
Volume
11
Category
Article
ISSN
0951-4198

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✦ Synopsis

The observation of what are believed to be small multiply charged clusters generated in a laser-produced plasma is reported and discussed, and a possible formation mechanism is proposed. Homonuclear gold cluster ions comprising three atoms and carrying charges of up to + 5, and of four atoms carrying charges of up to + 3, or possibly + 4, were observed. With a carbon sample, cluster ions of charge up to + 6 and of mass slightly greater than that of four carbon atoms were also observed. The observation of such non-integer cluster ion to single atom ion mass ratios may indicate the generation of heteronuclear cluster ions formed between the atoms of the target material and vacuum contamination. Non-integer mass ratios were also obtained for gold. It is proposed that the cluster ions form through the influence of a small background gas pressure which enables neutrals, generated through recombination, to aggregate on to single atom ions. The observation of Au 3 2 + , Au 4 3 + and of small multiply charged homonuclear carbon cluster ions has also been reported by other workers using different sources. The observation of Au 3 4 + and Au 3 5 + , and what appears to be small multiply charged heteronuclear carbon cluster ions is new.

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