The role of continuum radiation in laser induced plasma spectroscopy

被引：96
作者：
De Giacomo, A. [1 ,2 ]
Gaudiuso, R. [1 ]
Dell'Aglio, M. [2 ]
Santagata, A. [3 ]
机构：
[1] Univ Bari, Dept Chem, I-70126 Bari, Italy
[2] CNR IMIP, I-70126 Bari, Italy
[3] CNR IMIP, I-85050 Tito, PZ, Italy
来源：
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY | 2010年 / 65卷 / 05期
关键词：
Spectral continuum; LIBS; High-density plasma; Free-bound transitions; TEMPERATURE; ABLATION; DENSITY; ATOMS; PULSE; AIR;
D O I：
10.1016/j.sab.2010.03.016
中图分类号：
O433 [光谱学];
学科分类号：
0703 ; 070302 ;
摘要：
This paper focuses on the interpretation of the origin of the continuum radiation in Laser Induced Plasma (LIP) emission spectra, a subject that has received little consideration in the literature when compared to the analysis of the line emission spectrum. The understanding of the spectral peculiarities observed immediately after the laser pulse, when the continuum radiation prevails on discrete emission lines, can be extremely important to retrieve the initial conditions of LIP and to correlate the produced plasma to the ablation mechanism. In this work, in addition to a qualitative interpretation of the LIP continuum in the initial stage of expansion, a methodology is proposed for a better measurement of the atomic temperature in the expansion stage of the LIP. Such methodology is based on the analysis of the combined Boltzmann and Planck plots. The results obtained stress once again the importance of considering non equilibrium effects in the initial stage of LIP expansion. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：385 / 394
页数：10
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