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Depth profiling of coated metallic artificial adopting laser-induced breackdown spectrometry (Articolo in rivista)

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Depth profiling of coated metallic artificial adopting laser-induced breackdown spectrometry (Articolo in rivista) (literal)

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M. Abdelhamid; E. Angelini; S. Grassini; G.M. Ingo; M. El Harith (2010)
Depth profiling of coated metallic artificial adopting laser-induced breackdown spectrometry
in Spectrochimica acta. Part B, Atomic spectroscopy; Pergamon-Elsevier Science Ltd., Oxford (Regno Unito)
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Laser-induced breakdown spectroscopy (LIBS) is a relatively novel technique that is being applied to the characterization of interfaces in layered materials as an alternative to other classic surface analytical techniques. In the presentwork the change of laser irradiance(W/cm2) by changing theworking distance (WD),which is the difference between the lens-to-sample distance and the focal length of the lens, has been found to be a very critical parameter. The effect of changingWD on the intersection point, the average ablation rate and the crater depth of Au and Ag thin films onto Cu substrates has been studied by using 50 mJ, Nd:YAG laser pulses. The experimental findings obtained, particularly interesting for cultural heritage field-applications, show that lowering the irradiance, the average ablation rate decreases and depth of the crater becomes less. Moreover the possibility of employing relatively high energy laser pulses for depth profiling analysis has been demonstrated. The technique has been applied on a gold coated archeological decorative copper object and reasonable results have been obtained. (literal)

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M. Abdelhamid; M.A. Harith National Institute of Laser Enhanced Science, Cairo University, Giza, Egypt S. Grassini; E. Angelini Dipartimento di Scienza dei Materiali ed Ingegneria Chimica, Politecnico di Torino, Italy G.M. Ingo Istituto per lo Studio dei Materiali Nanostrutturati, CNR, via Salaria Km 29.5, 00015 Monterotondo, Rome, Italy (literal)

Titolo

Depth profiling of coated metallic artificial adopting laser-induced breackdown spectrometry (literal)

Abstract

Laser-induced breakdown spectroscopy (LIBS) is a relatively novel technique that is being applied to the characterization of interfaces in layered materials as an alternative to other classic surface analytical techniques. In the presentwork the change of laser irradiance(W/cm2) by changing theworking distance (WD),which is the difference between the lens-to-sample distance and the focal length of the lens, has been found to be a very critical parameter. The effect of changingWD on the intersection point, the average ablation rate and the crater depth of Au and Ag thin films onto Cu substrates has been studied by using 50 mJ, Nd:YAG laser pulses. The experimental findings obtained, particularly interesting for cultural heritage field-applications, show that lowering the irradiance, the average ablation rate decreases and depth of the crater becomes less. Moreover the possibility of employing relatively high energy laser pulses for depth profiling analysis has been demonstrated. The technique has been applied on a gold coated archeological decorative copper object and reasonable results have been obtained. (literal)

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