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

Authors

Changmao Li, Huazhong University of Science and Technology
Lianbo Guo, Huazhong University of Science and Technology
Xiangnan He, University of Nebraska-Lincoln
Zhongqi Hao, Huazhong University of Science and Technology
Xiangyou Li, Huazhong University of Science and Technology
Meng Shen, Huazhong University of Science and Technology
Xiaoyan Zeng, Huazhong University of Science and TechnologyFollow
Yongfeng Lu, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

2014

Citation

J. Anal. At. Spectrom., 2014, 29, 638–643

Comments

Copyright 2014 The Royal Society of Chemistry

Abstract

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.