학술논문
Early stage emission spectroscopy study of metallic titanium plasma induced in air by femtosecond- and nanosecond-laser pulses
Document Type
Report
Author
Source
Spectrochimica Acta Part B: Atomic Spectroscopy. August 31, 2005, Vol. 60 Issue 7-8, p935, 13 p.
Subject
Language
English
ISSN
0584-8547
Abstract
To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.sab.2005.05.026 Byline: A. De Giacomo (a), M. Dell'Aglio (b), A. Santagata (c), R. Teghil (d) Keywords: Fs laser-induced plasma; Titanium; LIBS; Elementary processes Abstract: In this work the laser induced plasma obtained in air at atmospheric pressure by the interaction of a fs (femtosecond) or a ns (nanosecond) laser pulse with a metallic titanium target has been investigated by optical emission spectroscopy. The temporal evolution of plasma parameters such as electron number density and excitation temperature has been determined in order to highlight the processes involved when the emission spectra are acquired at short time delays from the ablating laser pulse. A survey of elementary processes implicated during plasma formation and expansion of ns- and fs-Laser Induced Plasma has been performed. Departures from equilibrium conditions are even discussed. The dynamic aspects corresponding to ns- and fs-LIP have been investigated by optical time of flight (TOF) and by fast emission imaging. The overall results have been used for clarifying the basic mechanisms occurring during plasma expansion due to either ns or fs laser source when experimental conditions usually used for laser-induced breakdown spectroscopy (LIBS) applications are employed. Author Affiliation: (a) Dip. Chimica, Universita degli Studi di Bari, Via Orabona 4, 70126 Bari, Italy (b) CNR-IMIP-BA, Via Amendola 122/D, 70126 Bari, Italy (c) CNR-IMIP-PZ, Zona Industriale, 85050 Tito Scalo (PZ), Italy (d) Dip. Chimica, Universita degli Studi della Basilicata, Via N. Sauro 85, 85100 Potenza, Italy Article History: Received 15 December 2004; Accepted 16 May 2005 Article Note: (footnote) [star] This paper was presented at the 3rd International Conference on Laser Induced Plasma Spectroscopy and Applications (LIBS 2004), held in Torremolinos (Malaga, Spain), 28 September-1 October 2004, and is published in the special issue of Spectrochimica Acta Part B, dedicated to that conference.