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Angular distributions of flux and energy of the ions emitted during pulsed laser ablation of copper

Published online by Cambridge University Press:  13 April 2011

A. H. Dogar ,
B. Ilyas ,
H. Qayyum ,
S. Ullah  and
A. Qayyum
A. H. Dogar
Affiliation:
Physics Division, Pakistan Institute of Nuclear Science and Technology, P.O. Nilore, 45650 Islamabad, Pakistan
B. Ilyas
Affiliation:
Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad, Pakistan
H. Qayyum
Affiliation:
Department of Physics, COMSATS Institute of Information Technology, Islamabad, Pakistan
S. Ullah
Affiliation:
Physics Division, Pakistan Institute of Nuclear Science and Technology, P.O. Nilore, 45650 Islamabad, Pakistan
A. Qayyum*
Affiliation:
Physics Division, Pakistan Institute of Nuclear Science and Technology, P.O. Nilore, 45650 Islamabad, Pakistan
*
qayyum@pinstech.org.pk
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Abstract

An experimental study on the pulsed laser ablation of copper by using Nd-YAG laser radiation of 1064 nm wavelength at a fluence of 13 J/cm2 is reported. A time-resolving plane Langmuir probe, placed at various angles with respect to the target surface normal, is used to record temporal variation of ion currents during the plasma expansion in vacuum. The measured angular distributions of integrated ion yields are strongly peaked in forward direction. The experimentally determined plume expansion coefficient Zinf/Xinf = 2.1±0.2 is in good agreement with the previous studies. Time-of-flight measurements indicated that the energy of various ion components is highest along target surface normal and decreases with increase of the angle, however the effect of angle is more pronounced on the faster ions. The energy spread of the ions decreases approximately from ±670 eV to ±19 eV as the probe angle increases from 0° to 60°. The measured angular dependence of ion yield and most probable ion energy nicely follows the trends predicted by Anisimov's plume expansion model.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 54 , Issue 1 , April 2011 , 10301
Copyright
© EDP Sciences, 2011

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