A combination of spark discharge and nanoparticle-enhanced laser-induced plasma spectroscopy is investigated.Depositing Au nanoparticles at the surface of a brass target can enhance the coupling of the target and the ...A combination of spark discharge and nanoparticle-enhanced laser-induced plasma spectroscopy is investigated.Depositing Au nanoparticles at the surface of a brass target can enhance the coupling of the target and the laser.More atoms in the brass sample are excited.As a secondary excitation source,spark discharge reheats the generated plasma,which further amplifies the enhancement results of nanoparticles.The spectral intensity with the spark discharge increases more obviously with nanoparticle concentration increasing than without the spark discharge.Also,plasma temperature and electron density are calculated by the Boltzmann plot and Stark broadening.The changes in the plasma temperature and electron density are consistent with the spectral emission changes.展开更多
Laser-induced breakdown spectroscopy(LIBS)is an important technique which is widely used to analyze element composition.In order to improve the sensitivity of LIBS,much effort has been made to enhance the spectral int...Laser-induced breakdown spectroscopy(LIBS)is an important technique which is widely used to analyze element composition.In order to improve the sensitivity of LIBS,much effort has been made to enhance the spectral intensity of LIBS by proposing a number of methods.In addition,we find that laser polarization has great influence on the emission intensity of femtosecond LIBS.By comparing the emission intensity of femtosecond LIBS in the circular polarization with that in the linear polarization,the spectral intensity in the case of circular polarization is stronger than that in the case of linear polarization.Moreover,this phenomenon is more obvious as laser energy increases.The polarization plays an important role in LIBS signal intensity.Based on the observation,the enhanced mechanism of the laser polarization for the spectral intensity is discussed in this paper,which will be helpful in spectral analysis and component analysis.展开更多
基金Project supported by the National Key Research and Development Program of China(Grant No.2019YFA0307701)the National Natural Science Foundation of China(Grant Nos.11674128,11674124,and 11974138)the Jilin Provincial Scientific and Technological Development Program,China(Grant No.20170101063JC)。
文摘A combination of spark discharge and nanoparticle-enhanced laser-induced plasma spectroscopy is investigated.Depositing Au nanoparticles at the surface of a brass target can enhance the coupling of the target and the laser.More atoms in the brass sample are excited.As a secondary excitation source,spark discharge reheats the generated plasma,which further amplifies the enhancement results of nanoparticles.The spectral intensity with the spark discharge increases more obviously with nanoparticle concentration increasing than without the spark discharge.Also,plasma temperature and electron density are calculated by the Boltzmann plot and Stark broadening.The changes in the plasma temperature and electron density are consistent with the spectral emission changes.
基金National Natural Science Foundation of China(Grant Nos.11674128,11674124,and 11974138)the Jilin Provincial Scientific and Technological Development Program,China(Grant No.20170101063JC)the Scientific and Technological Research Project of the Education Department of Jilin Province,China(Grant No.JJKH20200937KJ).
文摘Laser-induced breakdown spectroscopy(LIBS)is an important technique which is widely used to analyze element composition.In order to improve the sensitivity of LIBS,much effort has been made to enhance the spectral intensity of LIBS by proposing a number of methods.In addition,we find that laser polarization has great influence on the emission intensity of femtosecond LIBS.By comparing the emission intensity of femtosecond LIBS in the circular polarization with that in the linear polarization,the spectral intensity in the case of circular polarization is stronger than that in the case of linear polarization.Moreover,this phenomenon is more obvious as laser energy increases.The polarization plays an important role in LIBS signal intensity.Based on the observation,the enhanced mechanism of the laser polarization for the spectral intensity is discussed in this paper,which will be helpful in spectral analysis and component analysis.
