Diagnosis of electron temperature and density in the early stage of laser-produced Si plasma expansion

被引：7

作者：

Wang, Kaiping ^{[1
]}

Su, Maogen ^{[1
,2
,3
]}

Cao, Shiquan ^{[1
]}

Ma, Pengpeng ^{[1
]}

Sun, Duixiong ^{[1
,2
,3
]}

Min, Qi ^{[1
]}

Dong, Chenzhong ^{[1
,2
,3
]}

机构：

[1] Northwest Normal Univ, Coll Phys & Elect Engn, Key Lab Atom & Mol Phys & Funct Mat Gansu Prov, Lanzhou 730070, Peoples R China

[2] Northwest Normal Univ, Joint Lab Atom & Mol Phys, Lanzhou 730070, Peoples R China

[3] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730070, Peoples R China

来源：

PHYSICS OF PLASMAS | 2020年 / 27卷 / 06期

关键词：

EQUILIBRIUM; VALIDITY; ELEMENTS; LINES;

D O I：

10.1063/5.0005859

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

We measured time-resolved spectra of laser-produced plasma of Si in a vacuum at the early phase evolution (30-100ns) and found clear signs of spectral line broadening. Based on the measured line intensities of Si2+ and Si3+ ions, the Saha-Boltzmann method is used to diagnose the electron temperature. The Stark broadening of different high-charge ion lines is combined with a modified Griem semi-empirical formula to diagnose the electron density of Si plasma in the early evolutionary stage. The effects of self-absorption, natural broadening, and Doppler broadening on the spectral profiles were evaluated. We also conducted experiments to verify that current experimental conditions satisfied the local thermodynamic equilibrium conditions. Finally, time evolutions for the electron temperature and electron density in the early stage of plasma evolution were obtained.

引用

页数：6

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