scholarly journals Investigation of Non-Uniformity of Classically-Polished Fused Silica Surfaces via Laser-Induced Breakdown Spectroscopy

2019 ◽  
Vol 215 ◽  
pp. 08003
Author(s):  
Christoph Gerhard ◽  
Jörg Hermann
Keyword(s):  
Optical Properties ◽  
Chemical Composition ◽  
Fused Silica ◽  
Laser Induced Breakdown Spectroscopy ◽  
Aluminium Content ◽  
Breakdown Spectroscopy ◽  
Silica Surfaces ◽  
Laser Induced Breakdown ◽  
High Aluminium

In this contribution, the surface uniformity of classically-manufactured fused silica windows was investigated via laser-induced breakdown spectroscopy. It is shown that for all investigated samples a comparatively high aluminium content was found at the edge of the surface with respect to its centre. This contamination can be attributed to residues from lapping and polishing agents and leads to a mentionable non-uniformity of the surface in terms of chemical composition and optical properties, respectively.

Laser-induced breakdown spectroscopy (LIBS) technique for the determination of the chemical composition of complex inorganic materials

2014 ◽  
Author(s):  
Łukasz Łazarek ◽  
Arkadiusz J. Antończak ◽  
Michał R. Wójcik ◽  
Paweł E. Kozioł ◽  
Bogusz Stępak ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Inorganic Materials ◽  
Laser Induced Breakdown Spectroscopy ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

scholarly journals Preparation of Modified Kaolin Filler with Cesium and Its Application in Security Paper

2013 ◽  
Vol 2013 ◽  
pp. 1-7
Author(s):  
Houssni El-Saied ◽  
Samya El-Sherbiny ◽  
Omnia Ali ◽  
Wafaa El-Saied ◽  
Said Rohyem
Keyword(s):  
Optical Properties ◽  
Gamma Irradiation ◽  
Esr Spectroscopy ◽  
Laser Induced Breakdown Spectroscopy ◽  
Breakdown Spectroscopy ◽  
Cesium Ions ◽  
Spin Resonance ◽  
Batch Technique ◽  
Laser Induced Breakdown ◽  
Different Doses

In this study, cesium was added intentionally during paper manufacture for protecting the papers against forgery and counterfeiting by sorbing cesium ions (Cs+) on kaolin, used as special filler in papermaking. The sorption of cesium from aqueous solution by kaolin was studied as a function of pH, shaking time, cesium initial concentration, and mass of kaolin using batch technique. The results showed that a solution containing 10 mg/L Cs+and 250 mg of kaolin at pH 6 can be used to modify the kaolin. Paper handsheets were prepared containing various percentages of the modified kaolin. The mechanical and optical properties of paper handsheets were studied. The prepared paper handsheets were irradiated by gamma irradiation using different doses. Fourier transform infrared (FTIR) spectroscopy was used to study the effect of kaolin modification by cesium and gamma irradiation on paper handsheets properties. The results indicated that modified kaolin enhanced the mechanical and optical properties of paper handsheets. Electron spin resonance (ESR) spectroscopy and laser-induced breakdown spectroscopy (LIBS) were also used. They provided rapid, sensitive and nondestructive techniques in differentiating between different questioned documents. This study presents a new concept in manufacturing security papers and anticounterfeiting applications.

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