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Title: Droplet distributions from melt displacement and ejection mechanism during Al ns-laser ablation and deposition experiments: Influence of laser spot position

Experimental observations of the angular distribution of droplets during laser ablation and deposition of Al thin films are presented and discussed. The experimental results, obtained by simply moving the laser spot position with respect to the rotation axis of the target, allow clarification of the unexpected symmetric double peaked angular droplet distribution on the films. These results provide direct evidence that a laser fluence threshold exists, beyond which droplets are generated from a melt displacement and ejection mechanism rather than from a phase explosion. The main directions of particulate ejection are related to the particular geometry of the laser generated tracks, whose profiles depend on the relative position of the incident beam with respect to the rotation axis of the target.
Authors:
 [1] ; ;  [2] ; ;  [3] ;  [2] ;  [4]
  1. Cornell Laboratory for Accelerator-based Sciences and Education, Cornell University, Ithaca, New York 14853 (United States)
  2. Department of Mathematics and Physics “E. De Giorgi,” University of Salento, 73100 Lecce (Italy)
  3. Chemical Engineering Department and ICEMS, Instituto Superior Tecnico, Universidade Tecnica de Lisboa, Lisbon (Portugal)
  4. (Italy)
Publication Date:
OSTI Identifier:
22277956
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABLATION; ALUMINIUM; ANGULAR DISTRIBUTION; DEPOSITION; DROPLETS; LASER RADIATION; ROTATION; SPIN GLASS STATE; THIN FILMS