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Title: Laser-induced breakdown spectroscopy of tantalum plasma

Laser Induced Breakdown spectroscopy (LIBS) of Tantalum (Ta) plasma has been investigated. For this purpose Q-switched Nd: YAG laser pulses (λ∼ 1064 nm, τ∼ 10 ns) of maximum pulse energy of 100 mJ have been employed as an ablation source. Ta targets were exposed under the ambient environment of various gases of Ar, mixture (CO{sub 2}: N{sub 2}: He), O{sub 2}, N{sub 2}, and He under various filling pressure. The emission spectrum of Ta is observed by using LIBS spectrometer. The emission intensity, excitation temperature, and electron number density of Ta plasma have been evaluated as a function of pressure for various gases. Our experimental results reveal that the optical emission intensity, the electron temperature and density are strongly dependent upon the nature and pressure of ambient environment. The SEM analysis of the ablated Ta target has also been carried out to explore the effect of ambient environment on the laser induced grown structures. The growth of grain like structures in case of molecular gases and cone-formation in case of inert gases is observed. The evaluated plasma parameters by LIBS analysis such as electron temperature and the electron density are well correlated with the surface modification of laser irradiated Tamore » revealed by SEM analysis.« less
Authors:
; ; ; ;  [1]
  1. Centre for Advanced Studies in Physics, GC University, Lahore (Pakistan)
Publication Date:
OSTI Identifier:
22227967
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 7; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 36 MATERIALS SCIENCE; ABLATION; ARGON; CARBON DIOXIDE; ELECTRON DENSITY; ELECTRON TEMPERATURE; ELECTRONS; EMISSION SPECTRA; EXCITATION; EXCITED STATES; HELIUM; ION TEMPERATURE; IRRADIATION; LASER-PRODUCED PLASMA; NEODYMIUM LASERS; PLASMA DENSITY; PLASMA DIAGNOSTICS; PLASMA PRESSURE; Q-SWITCHING; SCANNING ELECTRON MICROSCOPY; TANTALUM