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Influence of ambient gas and its pressure on the laser-induced breakdown spectroscopy and the surface morphology of laser-ablated Cd

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Abstract

The ablation of Cd has been performed by employing Q-switched Nd: YAG 10 ns laser pulses with a central wavelength of 1064 nm for a pulsed energy of 200 mJ under various ambient environments of argon, air and helium. The optical emission spectroscopy of Cd plasma has been studied under different filling pressures of shield gases ranging from 5 torr to 760 torr using LIBS spectrometer system. The effect of different gases and their pressures on the intensity of spectral emission, electron temperature and density of the laser-produced plasma has been investigated. SEM analysis has been performed to investigate the dependence of surface morphological changes of an irradiated target on the nature and pressure of an ambient gas. A strong correlation has revealed the vital role of electron temperature and density of laser-induced plasma for the surface modification of Cd. These results strongly indicate that the nature and pressure of the ambient atmosphere is one of the controlling factors of the plasma characteristics, as well as the factors related to the laser energy absorption for surface modification.

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Acknowledgements

We acknowledge the Higher Education Commission of Pakistan for funding the project ‘Strengthening of Laser Lab Facilities at GC University Lahore’. We also acknowledge Ahsan Mushtaq and Director CASP for providing the SEM facilities.

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Authors and Affiliations

  1. Centre for Advanced Studies in Physics, GC University Lahore, Lahore, Pakistan

    Shazia Bashir, Nazar Farid & Khaliq Mahmood

  2. Department of Physics, University of Engineering and Technology Lahore, Lahore, Pakistan

    M. Shahid Rafique

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  1. Shazia Bashir
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  2. Nazar Farid
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  3. Khaliq Mahmood
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  4. M. Shahid Rafique
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Correspondence to Shazia Bashir.

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Bashir, S., Farid, N., Mahmood, K. et al. Influence of ambient gas and its pressure on the laser-induced breakdown spectroscopy and the surface morphology of laser-ablated Cd. Appl. Phys. A 107, 203–212 (2012). https://doi.org/10.1007/s00339-011-6730-4

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  • DOI: https://doi.org/10.1007/s00339-011-6730-4

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