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Angular distribution and forward peaking of laser produced plasma ions

Published online by Cambridge University Press:  07 June 2005

M. SHAHID RAFIQUE ,
M. KHALEEQ-UR-RAHMAN ,
MUHAMMAD SHAHBAZ ANWAR ,
FARYAAL MAHMOOD AFSHAN ASHFAQ  and
KHURRAM SIRAJ
M. SHAHID RAFIQUE
Affiliation:
Department of Physics, University of Engineering and Technology, Lahore, Pakistan
M. KHALEEQ-UR-RAHMAN
Affiliation:
Department of Physics, University of Engineering and Technology, Lahore, Pakistan
MUHAMMAD SHAHBAZ ANWAR
Affiliation:
Department of Physics, University of Engineering and Technology, Lahore, Pakistan
FARYAAL MAHMOOD AFSHAN ASHFAQ
Affiliation:
Department of Physics, University of Engineering and Technology, Lahore, Pakistan
KHURRAM SIRAJ
Affiliation:
Department of Physics, University of Engineering and Technology, Lahore, Pakistan
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Abstract

This paper represents the results of a study of angular distribution of laser produced ions (LPI) of Al, Cu, and Ag. The angular distribution is studied by CR-39 (SSNTD) and ion assisted sputtering experiments. A Q-Switched Nd:YAG laser (1.064 μm, 1.1 MW) with 10 mJ pulsed energy was used to produce the Ag ions, which were detected by CR-39 detector mounted at −17.5°, 0°, 17.5°, 30°, 60°, and 90° from the normal to the target placed at a distance of 9 cm from the target. Etched CR-39 detectors then observed under the Motic DMB Series optical microscope. A bunch of ions was detected along the normal of target due to self generated collimation of ions. This is termed as Forward Peaking of Laser Produced Ions. Similar results were also observed from sputtering of polished Al substrate by laser produced ions of Cu and Sputtering of polished Cu substrate by laser produced ions of Al. The surface morphology of the ion irradiated samples were observed under the Scanning Electron microscope (SEM) S 300 Hi-tech. Formation of a circular damage on the surface of the substrates by irradiation conforms the ions collimation along the normal or Forward Peaking of ions.

Keywords

Forward peakingLaser produced IonsMotic DMB seriesSEM S300 Hi-techSolid state nuclear track detector (SSNTD)Sputtering
Type
Research Article
Information
Laser and Particle Beams , Volume 23 , Issue 2 , June 2005 , pp. 131 - 135
Copyright
2005 Cambridge University Press

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