Journal
APPLIED SURFACE SCIENCE
Volume 278, Issue -, Pages 273-277Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2013.01.214
Keywords
Laser ablation; Ion energy; Ion distribution; Angle resolved energy spectra; Anisimov model
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The ion energy in a silver ablation plume for fluence in the range of 0.6-2.4 J cm(-2), typical for a pulsed laser deposition (PLD) experiment has been investigated. In this fluence range the ion fraction of the ablated particles becomes gradually dominant and can be utilized to characterize the ablation process. A silver target in vacuum was irradiated with a Nd:YAG laser at a wavelength of 355 nm and detailed measurements of the time-resolved angular distribution of plume ions were made. In contrast to earlier work, the beam spot was circular such that any flip-over effect of the plume is avoided. The angular energy distribution of ions in forward direction exceeds values of 500 eV, while at large angles the ion energy tail is below 100 eV. The maximum for the time-of-flight distributions agrees consistently with the prediction of Anisimov's model in the low fluence range, in which hydrodynamic motion prevails. (C) 2013 Elsevier B.V. All rights reserved.
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