Use of ns and fs pulse excitation in laser-induced breakdown spectroscopy to improve its analytical performances: A case study on quaternary bronze alloys

摘要: Abstract Analytical performances of Laser Induced Breakdown Spectroscopy (LIBS) resulted not fully satisfactory in some cases such as historical bronzes, therefore, efforts should be focussed on improving ablation efficiency and better understanding the plasma parameter evolution. To this aim a set double pulse experiments have been carried out almost collinear geometry at about 530 nm laser excitation. The first emitting source was either ns or fs second one. Data were collected function interpulse delay, order to determine increase, study kinetics parameters (temperature, electron density) decay atomic ionic intensities with respect optical background. In parallel previously developed model for ablation, ionization following decay, implemented, adding pulse, analyse excitation considered geometry, time evolution same variables investigated. Model results are able reproduce observed experimental trends support possibility analytical by using technique inter-pulse delays entire investigated range.