title: Effects of laser pulse sequence on laser-induced soil plasma emission.
abstract: In this study, we investigated the effects of a sequence of laser pulses on the plasma emission intensity, plasma temperature, and electron density of laser-induced soil plasma. The experimental results indicate that the plasma radiation was gradually strengthened as the laser-pulse sequence progressed. The theoretical results show that the spectral line intensity and spectral signal-to-background ratio of the elements Fe, Mn, K, and Ti were strongest for plasma from the sixth laser pulse. These data suggest that repeatedly ablating the same surface position of a soil sample with a sequence of laser pulses can enhance the laser-induced breakdown spectroscopy signal.
authors.affiliation: College of Physics Science and Technology, Hebei University, Baoding, Hebei 071002, China.
authors.forename: Jinzhong
authors.initials: J
authors.lastname: Chen
authors.forename: Zhenyu
authors.initials: Z
authors.lastname: Chen
authors.forename: Jiang
authors.initials: J
authors.lastname: Sun
authors.forename: Xu
authors.initials: X
authors.lastname: Li
authors.forename: Zechao
authors.initials: Z
authors.lastname: Deng
authors.forename: Yinglong
authors.initials: Y
authors.lastname: Wang