Measurements of plasma temperature and electron density in laser-induced copper plasma by time-resolved spectroscopy of neutral atom and ion emissions.

Unnikrishnan, VK and Alti, Kamlesh and Kartha, VB and Santhosh, C and Gupta, GP and Suri, BM (2010) Measurements of plasma temperature and electron density in laser-induced copper plasma by time-resolved spectroscopy of neutral atom and ion emissions. Pramana Journal of Physics, 74 (6). pp. 983-993.

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Abstract

Plasma produced by a 355 nm pulsed Nd:YAG laser with a pulse duration of 6 ns focussed onto a copper solid sample in air at atmospheric pressure is studied spectroscopically. The temperature and electron density characterizing the plasma are measured by time-resolved spectroscopy of neutral atom and ion line emissions in the time window of 300{2000 ns. An echelle spectrograph coupled with a gated intensi¯ed charge coupled detector is used to record the plasma emissions. The temperature is obtained using the Boltzmann plot method and the electron density is determined using the Saha{Boltzmann equation method. Both parameters are studied as a function of delay time with respect to the onset of the laser pulse. The results are discussed. The time window where the plasma is optically thin and is also in local thermodynamic equilibrium (LTE),necessary for the laser-induced breakdown spectroscopy (LIBS) analysis of samples, is deduced from the temporal evolution of the intensity ratio of two Cu I lines. It is found to be 700{1000 ns.

Item Type: Article
Uncontrolled Keywords: Laser-induced plasma, spectroscopy,plasma temperature,electron density.
Subjects: Departments at MU > Atomic Molecular Physics
Depositing User: KMC Manipal
Date Deposited: 30 Sep 2011 04:39
Last Modified: 30 Sep 2011 04:39
URI: http://eprints.manipal.edu/id/eprint/1435

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