Study on the radiation and self-absorption characteristics of plasma under various background gases

Author:

Wang Junxiao,Liu Zhenrong1,Zhu Liping2,Song Zhen,Zhang Yan3,Zhang Lei,Zhang Wanfei1,Wang Gang1,Ye Zefu4,Zhu Zhujun4,Yin Wangbao,Jia Suotang

Affiliation:

1. Shanxi Xinhua Chemical Defense Equipment Research Institute Co., Ltd.

2. Information Center of China North Industries Group

3. Xi’an Technological University

4. Shanxi Gemeng U.S.-China Clean Energy R&D Center Co., Ltd.

Abstract

The self-absorption effect is a primary factor responsible for the decline in the precision of quantitative analysis techniques using plasma emission spectroscopy, such as laser-induced breakdown spectroscopy (LIBS). In this study, based on the thermal ablation and hydrodynamics models, the radiation characteristics and self-absorption of laser-induced plasmas under different background gases were theoretically simulated and experimentally verified to investigate ways of weakening the self-absorption effect in plasma. The results reveal that the plasma temperature and density increase with higher molecular weight and pressure of the background gas, leading to stronger species emission line intensity. To reduce the self-absorption effect in the later stages of plasma evolution, we can decrease the gas pressure or substitute the background gas with a lower molecular weight. As the excitation energy of the species increases, the impact of the background gas type on the spectral line intensity becomes more pronounced. Moreover, we accurately calculated the optically thin moments under various conditions using theoretical models, which are consistent with the experimental results. From the temporal evolution of the doublet intensity ratio of species, it is deduced that the optically thin moment appears later with higher molecular weight and pressure of the background gas and lower upper energy of the species. This theoretical research is essential in selecting the appropriate background gas type and pressure and doublets in self-absorption-free LIBS (SAF-LIBS) experiments to weaken the self-absorption effect.

Funder

National Key Research and Development Program of China

National Energy R&D Center of Petroleum Refining Technology

Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China

National Natural Science Foundation of China

111 Project

Fund for Shanxi “1331KSC”

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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