Effect of cylindrical cavity height on laser-induced breakdown spectroscopy with spatial confinement

• Published in: Plasma science & technology Vol. 19; no. 2; pp. 25506 - 25511
• Main Authors: Shao (邵俊峰), Junfeng, Wang (王挺峰), Tingfeng, Guo (郭劲), Jin, Chen (陈安民), Anmin, Jin (金明星), Mingxing
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.02.2017
• Subjects: cavity height; LIBS; signal enhancement; spatial confinement
• ISSN: 1009-0630; 1009-0630
• DOI: 10.1088/2058-6272/19/2/025506

In this paper, we present a study on the spatial confinement effect of laser-induced plasma with a cylindrical cavity in laser-induced breakdown spectroscopy (LIBS). The emission intensity with the spatial confinement is dependent on the height of the confinement cavity. It is found that, by selecting the appropriate height of cylindrical cavity, the signal enhancement can be significantly increased. At the cylindrical cavity (diameter = 2 mm) with a height of 6 mm, the enhancement ratio has the maximum value (approximately 8.3), and the value of the relative standard deviation (RSD) (7.6%) is at a minimum, the repeatability of LIBS signal is best. The results indicate that the height of confinement cavity is very important for LIBS technique to reduce the limit of detection and improve the precision.