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Title: Contribution of material’s surface layer on charge state distribution in laser ablation plasma

To generate laser ablation plasma, a pulse laser is focused onto a solid target making a crater on the surface. However, not all the evaporated material is efficiently converted to hot plasma. Some portion of the evaporated material could be turned to low temperature plasma or just vapor. To investigate the mechanism, we prepared an aluminum target coated by thin carbon layers. Then, we measured the ablation plasma properties with different carbon thicknesses on the aluminum plate. The results showed that C{sup 6+} ions were generated only from the surface layer. The deep layers (over 250 nm from the surface) did not provide high charge state ions. On the other hand, low charge state ions were mainly produced by the deeper layers of the target. Atoms deeper than 1000 nm did not contribute to the ablation plasma formation.
Authors:
 [1] ;  [2] ; ;  [3] ;  [4] ;  [2] ;  [4] ;  [5] ;  [1]
  1. Research Institute for Science and Engineering, Waseda University, Tokyo 169-8555 (Japan)
  2. (Japan)
  3. Collider-Accelerator Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
  4. Nishina Center for Accelerator-Based Science, RIKEN, Saitama 351-0198 (Japan)
  5. (United States)
Publication Date:
OSTI Identifier:
22482922
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 87; Journal Issue: 2; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ABLATION; ALUMINIUM; ATOMS; CARBON IONS; CHARGE STATES; CRATERS; HOT PLASMA; LASERS; LAYERS; PLATES; PULSES; SURFACES; THICKNESS