首页|A theoretical study of the signal enhance-ment mechanism of coaxial DP-LIBS

A theoretical study of the signal enhance-ment mechanism of coaxial DP-LIBS

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In the field of dual-pulse laser-induced breakdown spectroscopy(DP-LIBS)research,the pursuit of methods for determining pulse intervals and other parameters quickly and conveniently in order to achieve optimal spectral signal enhancement is paramount.To aid researchers in identification of optimal signal enhancement conditions and more accurate interpretation of the underlying signal enhancement mechanisms,theoretical simulations of the spatiotemporal processes of coaxial DP-LIBS-induced plasma have been established in this work.Using a model based on laser ablation and two-dimensional axisymmetric fluid dynamics,plasma evolutions during aluminum-magnesium alloy laser ablation under single-pulse and coaxial dual-pulse excitations have been simulated.The influences of factors,such as delay time,laser fluence,plasma temperature,and particle number density,on the DP-LIBS spectral signals are investigated.Under pulse intervals ranging from 50 to 1500 ns,the time evolutions of spectral line intensity,dual-pulse emission enhancement relative to the single-pulse results,laser irradiance,spatial distribution of plasma temperature and species number density,as well as laser irradiance shielded by plasma have been obtained.The study indicates that the main reason behind the radiation signal enhancement in coaxial DP-LIBS-induced plasma is attributed to the increased species number density and plasma temperature caused by the second laser,and it is inferred that the shielding effect of the plasma mainly occurs in the boundary layer of the stagnation point flow over the target surface.This research provides a theoretical basis for experimental research,parameter optimization,and signal enhancement tracing in DP-LIBS.

laser-induced plasmaradiation fluid dynamics modeldouble pulse laser-induced breakdown spectroscopy(DP-LIBS)laser ablationsignal enhancement mechanism

宋震、王俊霄、王钢、张雷、王树青、张婉飞、马晓飞、刘珍荣、罗学彬、马维光、叶泽甫、朱竹君、尹王保、贾锁堂

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State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Laser Spectroscopy,Shanxi University,Taiyuan 030006,People's Republic of China

Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,People's Republic of China

National Energy R & D Center of Petroleum Refining Technology(RIPP,SINOPEC),Beijing 100728,People's Republic of China

Shanxi Xinhua Chemical Defense Equipment Research Institute Co.Ltd.,Taiyuan 030003,People's Republic of China

Shanxi Gemeng US-China Clean Energy R & D Center Co.Ltd.,Taiyuan 030032,People's Republic of China

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国家重点研发计划National Energy Research and Development Center of Petroleum Refining Technology(RIPP,SINOPEC)Changjiang Scholars and Innovative Research Team at the University of the Ministry of Education of China国家自然科学基金国家自然科学基金国家自然科学基金111 ProjectFund for Shanxi

2017YFA0304203IRT17R706197510361875108627010407D180011331KSC

2024

10.1088/2058-6272/ad1ed1

等离子体科学和技术(英文版)
中国科学院合肥物质科学研究所 中国力学学会

等离子体科学和技术(英文版)

EI
影响因子：0.297
ISSN：1009-0630
年,卷(期)：2024.26(5)
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