Formation of neutral clusters during sputtering of gold

Polycrystalline Au was bombarded with 15 keV Ar +, and the resulting secondary neutral cluster yield distribution was measured by laser postionisation mass spectrometry. Neutral Au n clusters containing up to 20 atoms were observed. The yield of Au n clusters, Y n , was found to follow a power in n,...

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Bibliographic Details
Published in:Surface science 2009-03, Vol.603 (5), p.819-825
Main Authors: King, B.V., Veryovkin, I.V., Moore, J.F., Calaway, W.F., Pellin, M.J.
Format: Article
Language:English
Subjects:
Atom emission
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Gold
Ion bombardment
Laser methods
Physics
Sputtering
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Summary:Polycrystalline Au was bombarded with 15 keV Ar +, and the resulting secondary neutral cluster yield distribution was measured by laser postionisation mass spectrometry. Neutral Au n clusters containing up to 20 atoms were observed. The yield of Au n clusters, Y n , was found to follow a power in n, Y n ∝ n −3.4, but the yield of individual clusters depended on whether n was even or odd. This odd–even yield variation was caused by fragmentation of the cluster photoions. Simulation of photoion trajectories within the TOF spectrometer shows that the fragmentation dominantly occurs before the photoions enter the reflectron part of the spectrometer.
ISSN:0039-6028
1879-2758
DOI:10.1016/j.susc.2009.01.027