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

• Published in: Applied physics. A, Materials science & processing Vol. 107; no. 1; pp. 203 - 212
• Main Authors: Bashir, Shazia, Farid, Nazar, Mahmood, Khaliq, Shahid Rafique, M.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01.04.2012; Springer
• Subjects: Characterization and Evaluation of Materials; Condensed Matter Physics; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Machines; Manufacturing; Materials science; Nanotechnology; Optical and Electronic Materials; Physics; Physics and Astronomy; Physics of gases, plasmas and electric discharges; Physics of plasmas and electric discharges; Plasma production and heating; Plasma production and heating by laser beams; Processes; Surface treatments; Surfaces and Interfaces; Thin Films; Electron Number Density; Electron Temperature; Excitation Temperature; Optical Emission Intensity; Laser Energy Absorption; Cadmium; Radiation effects; Scanning electron microscopy; Morphological changes; Surface morphology; Laser-produced plasma; Controlled atmospheres; LIBS; Electron temperature; Laser pulse; Strong correlation; Emission spectra; Laser spectroscopy; Laser ablation technique; Electron density; Optical spectrum
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-011-6730-4

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.