Journal
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
Volume 66, Issue 9-10, Pages 661-670Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.sab.2011.09.003
Keywords
Excitation cross section; Laser plasma; Laser Induced Breakdown Spectroscopy; Elementary processes; Iron meteorite
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In Laser Induced Plasma Spectroscopy (LIPS) or Laser Induced Breakdown Spectroscopy (LIBS) the relation between recombining electrons and optical emission intensity has been studied in hydrogen and different metals targets. The role played by the electron impact excitation cross section on the temporal trend of emission lines has addressed and a methodology for the evaluation of the excitation cross sections by optical emission spectroscopy has beets tested on several species including H I. Fe I, Ni I, Co I and Ti II. In connection with the theory drawn in this paper, the results show a good agreement with respect to theoretical ones. These results allow the direct linking of the emission intensity to the electronic excitation binary collision. The latter does not depend on experimental conditions and can be applied for elemental analysis. The use of estimated cross sections forms the basis for a different calibration free approach. LIBS elemental analysis on iron meteorites (to be considered as ternary alloys) and on a set of copper based alloys demonstrates the promising use of this analytical approach. (C) 2011 Elsevier B.V. All rights reserved.
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