Element dependence of enhancement in optics emission from laser-induced plasma under spatial confinement

In this study, the element dependence of spatial confinement effects in LIBS has been studied. Hemispheric cavities were used to confine laser-induced plasmas from aluminum samples with other trace elements. The enhancement factors were found to be dependent on the elements. Equations describing the...

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Bibliographic Details
Published in:Journal of analytical atomic spectrometry 2014-04, Vol.29 (4), p.638-643
Main Authors: Li, Changmao, Guo, Lianbo, He, Xiangnan, Hao, Zhongqi, Li, Xiangyou, Shen, Meng, Zeng, Xiaoyan, Lu, Yongfeng
Format: Article
Language:English
Subjects:
Aluminum
Confinement
Electron density
Emission
Holes
Mathematical analysis
Spectrometry
Trace elements
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Summary:In this study, the element dependence of spatial confinement effects in LIBS has been studied. Hemispheric cavities were used to confine laser-induced plasmas from aluminum samples with other trace elements. The enhancement factors were found to be dependent on the elements. Equations describing the element-dependent enhancement factors were successfully deduced from the local thermodynamic equilibrium conditions, which have also been verified by the experimental results. Research results show that enhancement factors in LIBS with spatial confinement depend on the temperature, electron density, and compression ratio of plasmas, and vary with elements and atomic/ionic emission lines selected. Generally, emission lines with higher upper level energies have higher enhancement factors. Furthermore, with enhancement factor of a spectral line, temperatures and electron densities of plasmas known, enhancement factors of all the other elements in the plasmas could be estimated by the equations developed in this study. In this study, the element dependence of spatial confinement effects in LIBS has been studied.
ISSN:0267-9477
1364-5544
DOI:10.1039/c3ja50368b