Multiply negatively charged aluminium clusters: Production of Aln2- in a Penning trap
Eur. Phys. J. D 43 (1-3), 241-245, July 2007
Submitted to Cluster Science: 5 January 2010
Last Update: 6 January 2011

10.1140/epjd/e2007-00114-9
OA Status: can archive pre-print and post-print or publisher's version/PDF

Abstract

The first observation of gas-phase aluminium dianions, Aln 2-, is reported. Singly negatively charged aluminium clusters are converted to dianions by exposure to low-energy electrons in a Penning trap. Attachment of such secondary electrons to the monoanions leads to the formation of dianionic clusters, as earlier observed for the noble metals, copper, silver and gold. The present work extends the `electron-bath technique' to the trivalent aluminium. The observation of Aln 2- as a function of cluster size is compared to estimates of the second electron affinities of Aln as given by a combination of first electron affinities and the charged conducting-sphere model. This simple approach is found to describe the appearance size (size of smallest Aln 2- observed) very well.

Classifications

Document Type experimental
Research Field Charging Phenomena, Collisions and Fragmentation Processes

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