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Title: Kinetics of ion and prompt electron emission from laser-produced plasma

We investigated ion emission dynamics of laser-produced plasma from several elements, comprised of metals and non-metals (C, Al, Si, Cu, Mo, Ta, W), under vacuum conditions using a Faraday cup. The estimated ion flux for various targets studied showed a decreasing tendency with increasing atomic mass. For metals, the ion flux is found to be a function of sublimation energy. A comparison of temporal ion profiles of various materials showed only high-Z elements exhibited multiple structures in the ion time of flight profile indicated by the observation of higher peak kinetic energies, which were absent for low-Z element targets. The slower ions were seen regardless of the atomic number of target material propagated with a kinetic energy of 1–5 keV, while the fast ions observed in high-Z materials possessed significantly higher energies. A systematic study of plasma properties employing fast photography, time, and space resolved optical emission spectroscopy, and electron analysis showed that there existed different mechanisms for generating ions in laser ablation plumes. The origin of high kinetic energy ions is related to prompt electron emission from high-Z targets.
Authors:
 [1] ;  [2] ; ;  [1] ;  [3]
  1. Center for Materials Under Extreme Environment, School of Nuclear Engineering, Purdue University, West Lafayette, Indiana 47907 (United States)
  2. (China)
  3. Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, School of Physics and Optical Engineering, Dalian University of Technology, Dalian (China)
Publication Date:
OSTI Identifier:
22227977
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 7; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ABLATION; ALUMINIUM; COMPARATIVE EVALUATIONS; COPPER; ELECTRON EMISSION; EMISSION SPECTROSCOPY; FARADAY CUPS; ION EMISSION; IONS; KEV RANGE; LASER TARGETS; LASER-PRODUCED PLASMA; MOLYBDENUM; PLASMA DIAGNOSTICS; PLASMA PRODUCTION; PLASMA RADIAL PROFILES; SILICON; TANTALUM; TIME-OF-FLIGHT METHOD; TUNGSTEN