title: Discrimination of organic solid materials by LIBS using methods of correlation and normalized coordinates.
abstract: The methods of linear and rank correlation and normalized coordinates (MNC) have been applied to the identification of organic solid materials with a very similar chemical composition by laser-induced breakdown spectroscopy (LIBS). The present study evaluated these three statistical methods using an Echelle spectrometer coupled with an intensified charge-coupled device (ICCD). Moreover, three instrumental parameters (laser pulse energy, delay time and integration time) were evaluated in terms of their influence on the signal-to-noise ratio of carbon and hydrogen emission lines. The probability of a right identification can be estimated by means the described methods in this paper. Methods of correlation provide better identification and discrimination than normalized coordinates at a 95% confidence level.
authors.affiliation: Laser Laboratory and Environment, Department of Analytical Chemistry, Faculty of Sciences, University of Zaragoza, Pedro Cerbuna #12, 50009 Zaragoza, Spain.
authors.forename: R J
authors.initials: RJ
authors.lastname: Lasheras
authors.forename: C
authors.initials: C
authors.lastname: Bello-Gálvez
authors.forename: E M
authors.initials: EM
authors.lastname: Rodríguez-Celis
authors.forename: J
authors.initials: J
authors.lastname: Anzano
mesh_terms: D009930:Organic Chemicals / Q000032:analysis*; D013057:Spectrum Analysis / Q000379:methods*; D013696:Temperature
chemical_list: D009930:Organic Chemicals