Applied Physics B

, Volume 107, Issue 4, pp 1131–1143 | Cite as

Electron binding energies from collisional activation of metal-cluster dianions

Article

Abstract

Gold-cluster dianions \(\mathrm{Au}_{n}^{2-}\), n=21–31, have been investigated by use of multi-collisional excitation in a Penning trap. At low excitation energies the corresponding singly charged cluster anions have been observed, but no fragments, which indicates the emission of one electron. The binding energy of the surplus electron is deduced from the dianion yield observed as a function of the collision energy by use of a statistical model based on detailed balance. The resulting binding energies of the second electrons are in good agreement with a simple liquid-drop model with empirical corrections including the Coulomb barrier. The double difference of these energies shows a strong odd–even staggering which is compared to the behavior of the electron affinity of neutral gold clusters.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  1. 1.Institut für PhysikErnst-Moritz-Arndt-Universität GreifswaldGreifswaldGermany
  2. 2.FAIR GmbHDarmstadtGermany

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