Preprint Article Version 1 This version is not peer-reviewed

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

Version 1 : Received: 21 June 2019 / Approved: 22 June 2019 / Online: 22 June 2019 (11:43:23 CEST)

A peer-reviewed article of this Preprint also exists.

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. 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.

Journal reference: Atoms 2019, 7, 73
DOI: 10.3390/atoms7030073

Abstract

Q-switched laser radiation at wavelengths of 355 nm, 532 nm, and 1064 nm from a Nd: YAG laser was used to generate plasma in laboratory air at the target surface made of compressed 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.

Subject Areas

laser-induced plasma; atomic spectroscopy; self-reversal; self-absorption; nanoparticles; silver; hydrogen

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