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Opacity Corrections for Resonance Silver Lines in Nano-Material Laser-Induced Plasma

1
Laboratory of Laser and New Materials, Faculty of Science, Cairo University, Giza 12613, Egypt
2
Engineering Physics Department, Military Technical College, Cairo 11766, Egypt
3
Department of Physics and Astronomy, University of Tennessee, University of Tennessee Space Institute, Center for Laser Applications, 411 B. H. Goethert Parkway, Tullahoma, TN 37388, USA
*
Author to whom correspondence should be addressed.
Atoms 2019, 7(3), 73; https://doi.org/10.3390/atoms7030073
Received: 21 June 2019 / Revised: 26 July 2019 / Accepted: 29 July 2019 / Published: 31 July 2019
(This article belongs to the Special Issue Laser Plasma Spectroscopy Applications)
Q-switched laser radiation at wavelengths of 355, 532, and 1064 nm from a Nd: YAG laser was used to generate plasma in laboratory air at the target surface made of nano-silver particles of size 95 ± 10 nm. The emitted resonance spectra from the neutral silver at wavelengths of 327.9 nm and 338.2 nm indicate existence of self-reversal in addition to plasma self-absorption. Both lines were identified in emission spectra at different laser irradiation wavelengths with characteristic dips at the un-shifted central wavelengths. These dips are usually associated with self-reversal. Under similar conditions, plasmas at the corresponding bulk silver target were generated. The recorded emission spectra were compared to those obtained from the nano-material target. The comparisons confirm existence of self-reversal of resonance lines that emerge from plasmas produced at nano-material targets. This work suggests a method for recovery of the spectral line shapes and discusses practical examples. In addition, subsidiary calibration efforts that utilize the Balmer series Hα-line reveal that other Ag I lines at 827.35 nm and 768.7 nm are optically thin under variety of experimental conditions and are well-suited as reference lines for measurement of the laser plasma electron density. View Full-Text
Keywords: laser-induced plasma; atomic spectroscopy; self-reversal; self-absorption; nanoparticles; silver; hydrogen laser-induced plasma; atomic spectroscopy; self-reversal; self-absorption; nanoparticles; silver; hydrogen
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EL Sherbini, A.M.; EL Farash, A.H.; EL Sherbini, T.M.; Parigger, C.G. Opacity Corrections for Resonance Silver Lines in Nano-Material Laser-Induced Plasma. Atoms 2019, 7, 73.

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