Spatial confinement effects of laser-induced breakdown spectroscopy at reduced air pressures.

Content Provider	Europe PMC
Author	Hao, Zhongqi Deng, Zhiwei Liu, Li Shi, Jiulin He, Xingdao
Abstract	Spatial confinement is a simple and cost-effective method for enhancing signal intensity and improving the detection sensitivity of laser-induced breakdown spectroscopy (LIBS). However, the spatial confinement effects of LIBS under different pressures remains a question to be studied, because the pressure of the ambient gas has a significant influence on the temporal and spatial evolution of plasma. In this study, spatial confinement effects of LIBS under a series of reduced air pressures were investigated experimentally, and the plasma characteristics under different air pressures were studied. The results show that the reduced air pressure can lead to both earlier onset and weakening of the enhancement effect of the spatial confinement on the LIBS line intensity. When the air pressure drops to 0.1 kPa, the enhancement effect of the emission intensity no longer comes from the compression of the reflected shock wave on the plasma, but from the cavity’s restriction of the plasma expansion space. In conclusion, the enhancement effect of spatial confinement technology on the LIBS is still effective when the pressure is reduced, which further expands the research and application field of spatial confinement technology. Graphical abstract
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ISSN	20952759
Volume Number	15
DOI	10.1007/s12200-022-00020-9
PubMed Central reference number	PMC9756261
Issue Number	1
PubMed reference number	36637544
Journal	Frontiers of Optoelectronics [Front Optoelectron]
e-ISSN	20952767
Language	English
Publisher	Higher Education Press
Publisher Date	2022-04-28
Publisher Place	Beijing
Access Restriction	Open
Rights License	Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. © The Author(s) 2022
Subject Keyword	Laser-induced breakdown spectroscopy (LIBS) Spatial confinement Plasma temperature Stark broadening
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering