Double and triple ionization of silver clusters by electron impact

Journal of Physics. Condensed Matter : an Institute of Physics Journal
Avik HalderV Kresin

Abstract

The production of silver cluster cations Ag(n)(2+) (for several selected sizes in the range n = 39-119) and Ag(n)(3+) (for n = 58, 61, 67) by electron impact ionization of neutral precursors has been studied. The scaling of appearance energies with cluster radius follows the metallic droplet model but, curiously, with a slope which is estimated to be quite different from the literature values for single ionization, Ag(n)(+), as well as for the appearance of smaller Ag(n)(2+) ions. It is also found that as the electron energy increases, the yield of high-charge cations grows faster than that of singly-charged Ag(n)(+). This behavior is consistent with the power-law dependence of post-threshold ionization. The mechanisms involved in multiple ionization phenomena in clusters of noble metals are not yet fully understood and call for further experimental and theoretical examination.

References

Jul 15, 1985·Physical Review. B, Condensed Matter·W A SaundersW D Knight
Sep 25, 1989·Physical Review Letters·C BréchignacJ Leygnier
Mar 25, 2011·The Journal of Physical Chemistry. a·Roman RabinovitchVitaly V Kresin

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