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

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

Content Provider	Semantic Scholar
Author	Unnikrishnan, V. K. Alti, Kamlesh Kartha, V. B. Santhosh, Chella Gupta, G. P. Suri, B.
Copyright Year	2010
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 intensified 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.
Starting Page	983
Ending Page	993
Page Count	11
File Format	PDF HTM / HTML
DOI	10.1007/s12043-010-0089-5
Volume Number	74
Alternate Webpage(s)	http://repository.ias.ac.in/17885/1/348.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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