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Investigations on low temperature laser-generated plasmas

Published online by Cambridge University Press:  06 May 2008

F. Caridi ,
L. Torrisi ,
D. Margarone  and
A. Borrielli
F. Caridi*
Affiliation:
Dipartimento di Fisica, Messina, Italy and INFN-LNS and INFN Sezione di Catania (Gr. Coll. Messina), Catania, Italy
L. Torrisi
Affiliation:
Dipartimento di Fisica, Messina, Italy and INFN-LNS and INFN Sezione di Catania (Gr. Coll. Messina), Catania, Italy
D. Margarone
Affiliation:
Dipartimento di Fisica, Messina, Italy and INFN-LNS and INFN Sezione di Catania (Gr. Coll. Messina), Catania, Italy
A. Borrielli
Affiliation:
Dipartimento di Fisica, Messina, Italy and INFN-LNS and INFN Sezione di Catania (Gr. Coll. Messina), Catania, Italy
*
Address correspondence and reprint requests to: Francesco Caridi, Dipartimento di Fisica, Ctr. Papardo 31, 98166 S. Agata, Messina, Italy. E-mail: [email protected]
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Abstract

A nanosecond pulsed Nd-Yag laser, operating at an intensity of about 109 W/cm2, was employed to irradiate different metallic solid targets (Al, Cu, Ta, W, and Au) in vacuum. The measured ablation yield increases with the direct current (dc) electrical conductivity of the irradiated target. The produced plasma was characterized in terms of thermal and Coulomb interaction evaluating the ion temperature and the ion acceleration voltage developed in the non-equilibrium plasma core. The particles emission produced along the normal to the target surface was investigated measuring the neutral and the ion energy distributions and fitting the experimental data with the “Coulomb-Boltzmann-shifted” function. Results indicate that the mean energy of the distributions and the equivalent ion acceleration voltage of the non-equilibrium plasma increase with the free electron density of the irradiated element.

Keywords

Electron densityIon energy distributionLaser-generated plasma
Type
Research Article
Information
Laser and Particle Beams , Volume 26 , Issue 2 , June 2008 , pp. 265 - 271
Copyright
Copyright © Cambridge University Press 2008

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