| Self-absorption effects of laser-induced breakdown spectroscopy under different gases and gas pressures |
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| 作者姓名： | Songning WANG |
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| 作者单位： | 1. Superconductivity and New Energy R & D Center, Southwest Jiaotong University;2. School of Physical Science and Technology, Southwest Jiaotong University;3. School of Physics and Energy, Fujian Normal University |
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| 基金项目： | This work was supported by National Key Research and Development Program of China (Nos. 2017YFE0301306, 2017YFE0301300, and 2017YFE0301506). Fujian Province Industrial Guidance Project (No. 2019H0011). |
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| 摘 要： | The self-absorption effect is one of the main factors affecting the quantitative analysis accuracy of laser-induced breakdown spectroscopy. In this paper, the self-absorption effects of laserinduced 7050 Al alloy plasma under different pressures in air, Ar, and N2 have been studied.Compared with air and N2, Ar significantly enhances the spectral signal. Furthermore, the spectral self-absorption coefficient is calculated to quantify the degree of self-absorption, and the inf...
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| 收稿时间： | 2022-04-28 |
| 修稿时间： | 2022-07-09 |
Self-absorption effects of laser-induced breakdown spectroscopy under different gases and gas pressures |
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| Affiliation: | 1.Superconductivity and New Energy R & D Center, Southwest Jiaotong University, Chengdu 610036, People's Republic of China 2. School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610036, People's Republic of China 3. School of Physics and Energy, Fujian Normal University, Fuzhou 350117, People's Republic of China |
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| Abstract: | The self-absorption effect is one of the main factors affecting the quantitative analysis accuracy of laser-induced breakdown spectroscopy. In this paper, the self-absorption effects of laser-induced 7050 Al alloy plasma under different pressures in air, Ar, and N2 have been studied. Compared with air and N2, Ar significantly enhances the spectral signal. Furthermore, the spectral self-absorption coefficient is calculated to quantify the degree of self-absorption, and the influences of gas species and gas pressure on self-absorption are analyzed. In addition, it is found that the spectral intensity fluctuates with the change of pressure of three gases. It can also be seen that the fluctuation of spectral intensity with pressure is eliminated after correcting, which indicates that the self-absorption leads to the fluctuation of spectral intensity under different pressures. The analysis shows that the evolution of optical thin spectral lines with pressure in different gases is mainly determined by the gas properties and the competition between plasma confinement and Rayleigh–Taylor instability. |
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