Thermodynamic and spectroscopic properties of Nd:YAG-CO(2) Double-Pulse Laser-Induced Iron Plasmas

Double-Pulse Laser-Induced Breakdown Spectroscopy of iron using both Nd:YAG and TEA-CO(2) lasers has been investigated to better understand mechanisms of signal enhancement. The signal dependence on the delay between the two laser pulses shows an enhanced signal when the CO(2) laser pulse interacts...

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Bibliographic Details
Published in:Spectrochimica acta. Part B: Atomic spectroscopy 2009-10, Vol.64 (10), p.961-967
Main Authors: Weidman, M, Palanco, S, Baudelet, M, Richardson, M C
Format: Article
Language:English
Online Access:Get full text
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Summary:Double-Pulse Laser-Induced Breakdown Spectroscopy of iron using both Nd:YAG and TEA-CO(2) lasers has been investigated to better understand mechanisms of signal enhancement. The signal dependence on the delay between the two laser pulses shows an enhanced signal when the CO(2) laser pulse interacts with the sample before the Nd:YAG pulse. Signal kinetics and a simple model of sample heating by the CO(2) pulse show that the enhancement during the first 700ns is due primarily to sample heating. Images of the sample surface after ablation as well as time-integrated pictures of the plasma suggest that particles are ejected from the surface during the first microseconds after the arrival of the CO(2) pulse and provide fuel for the subsequent plasma created by the Nd:YAG laser.
ISSN:0584-8547
DOI:10.1016/j.sab.2009.07.023