A Nd:YAG laser with 10 9 W/cm 2 pulse intensity, operating at 532 nm wavelength, is used to ablate Ta and Cu targets placed in vacuum. The ablation process generates a plasma in front of the target surface, which expands along the normal to target surface. The ion and electron emissions from the plasma were measured by Faraday cups placed at different angles with respect to the normal to target surface. In the range of laser intensities from 10 7 to 10 9 W/cm 2 , the fast electron yield is lower than the ion yield and it increases at higher laser intensities. The ablation threshold, the emission yield, the ion and electron average energies and the plasma ion and electron temperatures were measured for ion and fast electron streams.
Bibliographical noteFunding Information:
The support of 5th National Committee of INFN through the PLAIA experiment is acknowledged. Authors thank Mr C. Marchetta and Mr E. Costa of INFN-LNS of Catania for the technical support given to this work. Thanks are due also to Mr Alfio Scuderi for the assistance given to the experimental measurements.
Copyright 2008 Elsevier B.V., All rights reserved.
- Ion and electron streams
- Non-equilibrium plasma
- Ta and Cu targets
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Materials Science(all)
- Condensed Matter Physics