样品温度对飞秒激光诱导Al等离子体中AlO光谱的影响  

Effect of Sample Temperature on Spectra of AlO Molecules in Femtosecond Laser-Induced Al Plasma

作　　者：代玉银[1] 孙艳[2] 冯志书[3] 于丹[2] 陈安民[4] 金明星[4] Dai Yuyin;Sun Yan;Feng Zhishu;Yu Dan;Chen Anmin;Jin Mingxing(Nuclear Medicine Department,Bethune First Hospital,Jilin University,Changchun 130021,Jilin,China;Basic Aviation College,Air Force Aviation University,Changchun 130022,Jilin,China;Aviation Operations Service College,Air Force Aviation University,Changchun 130022,Jilin,China;Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,Jilin,China)

机构地区：[1]吉林大学白求恩第一医院核医学科,吉林长春130021 [2]空军航空大学航空基础学院,吉林长春130022 [3]空军航空大学作战勤务学院,吉林长春130022 [4]吉林大学原子与分子物理研究所,吉林长春130012

出　　处：《中国激光》2024年第5期222-228,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(11674128,11674124,11974138)。

摘　　要：针对飞秒脉冲激光诱导击穿光谱(fs-LIBS)中Al靶温度对AlO分子光谱的影响进行了实验研究。通过测量AlO分子的光谱强度和振动温度,发现Al靶温度对fs-LIBS技术中AlO分子的光谱特性有显著的影响。研究结果表明,提高靶材温度能有效增强fs-LIBS中AlO分子的光谱信号强度,并提高分子的振动温度和寿命。此外,时间分辨光谱分析结果还揭示出在高Al靶温度条件下,AlO分子的辐射寿命较长,光谱信号强度较强。这意味着在高温下,分子能够停留更长的时间,增加了光谱信号的持续时间。通过调控飞秒激光能量和靶材温度,可以获得更强的分子发射和光谱信号,从而实现更高的灵敏度和准确性。研究结果为fs-LIBS技术中样品温度对分子光谱的调控机制研究提供了实验数据。Objective Laser-induced breakdown spectroscopy(LIBS)is a spectroscopic technique that uses laser-induced plasma.In recent years,research has focused on spectral-enhancement techniques aimed at improving the detection sensitivity and resolution of LIBS.During LIBS analysis,the sample temperature can influence the intensity and shape of the observed spectral signals.Increasing the sample temperature increases the thermal motion of atoms,ions,and molecules within the sample,thereby increasing the probability of excitation and emission and ultimately enhancing the intensity of the spectral signals.Moreover,the sample temperature can affect the excited-state lifetimes of the elements,which influences the spectral signals.Different elements have different excited-state lifetimes,and changing the sample temperature can alter the width,shape,and position of the spectral peaks.With the advancement of laser technology,femtosecond(fs)-pulsed lasers have been introduced in LIBS research,offering several advantages over traditional nanosecond LIBS.Owing to the extremely short pulse duration of femtosecond lasers,they can reduce background noise interference and improve the spectral signal resolution compared to nanosecond pulses.The energy of femtosecond pulses is highly concentrated and short-lived,resulting in minimal heat and energy transfer to the sample.Thus,using femtosecond lasers for spectroscopic analysis does not damage or alter the sample,making them particularly suitable for samples with low tolerance.Sparkinduced background signal interference,which often occurs in nanosecond LIBS,is reduced or avoided in fs-LIBS owing to the shorter pulse duration of femtosecond lasers.Furthermore,in nanosecond LIBS,longer pulse widths can lead to secondary heating of the plasma and plasma with a higher temperature,where atoms or ions dominate and molecules tend to dissociate.In contrast,femtosecond lasers generate plasma at a lower temperature,making it more favorable for molecular formation.Although numerous studies have explo

关 键 词：光谱学 激光诱导击穿光谱 飞秒激光 分子光谱 样品温度 ALO 

分 类 号：O657.31[理学—分析化学]