.png){kind=icon}
.png){kind=icon}
Return
Experimental study on competition between emission signal enhancement and suppression under spatial confinement in LIBS
.png){kind=icon}
PRE
AI
S
D
M
B
S
Y
DOI：10.1088/1361-6463/ae678e.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
In this work, a comprehensive study was conducted on the dynamic behavior and emission signal enhancement of laser-produced plasma, spatially confined by quartz pipes of varying diameters. A synchronized measurement system, combining time-resolved emission spectroscopy, plasma plume morphology imaging, and shockwave shadow imaging, was developed to investigate the complex interactions between the plasma plume, shockwaves, and the confining surfaces. We observed that smaller pipe diameters lead to a more intense compression of the plasma and a faster transformation of the shockwave from spherical to planar, which significantly deviates from the Taylor-Sedov blast wave model. While strong confinement increases plasma temperature and electron number density, the spectroscopic signal enhancement is not always proportional, and in the most confined case, the emission is even weakened. To understand this anomaly, we performed scanning electron microscopy analysis on the particles deposited on the inner pipe walls. The present study uncovers a previously undocumented experimental phenomenon where strong confinement results in larger and more irregular particle deposition, attributed to the hindered atomization process and accelerated plasma cooling. Our findings highlight the crucial role of both shockwave-induced plasma reheating and particle deposition in determining the overall spectroscopic signal, suggesting that an optimal confinement size is essential for maximizing emission enhancement in laser-induced breakdown spectroscopy.
Keywords:
LIBS
pipe confinement
signal enhancement and suppression
Journal
IF:
3.2
Papers:
2.6W
Citations:
4.9W
Organization
Cited Papers