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Investigations of laser-induced plasma in air by Thomson and Rayleigh scattering

Zhang, Hantian ; Wu, Yi ; Sun, Hao ; Yang, Fei ; Rong, Mingzhe ; Jiang, Fengfeng

Spectrochimica acta. Part B: Atomic spectroscopy, July 2019, Vol.157, pp.6-11 [Periódico revisado por pares]

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  • Título:
    Investigations of laser-induced plasma in air by Thomson and Rayleigh scattering
  • Autor: Zhang, Hantian ; Wu, Yi ; Sun, Hao ; Yang, Fei ; Rong, Mingzhe ; Jiang, Fengfeng
  • Assuntos: Laser-Induced Plasma ; Thomson Scattering ; Rayleigh Scattering ; Shockwave ; Laser-Induced Plasma ; Thomson Scattering ; Rayleigh Scattering ; Shockwave ; Chemistry ; Physics
  • É parte de: Spectrochimica acta. Part B: Atomic spectroscopy, July 2019, Vol.157, pp.6-11
  • Descrição: Laser Thomson scattering and Rayleigh scattering methods were applied to investigate the dynamics of laser-induced plasmas in atmospheric air. Laser-induced plasma was generated by a 1064 nm, 200 mJ Nd: YAG laser. Another nanosecond Nd: YAG laser (532 nm, 50 mJ) was used as the probe laser. The temporally and spatially resolved electron number density and temperature distributions of the laser-induced plasma were determined from the Thomson scattering spectra. From 1 μs to 21 μs after plasma generation, the electron number density around the centre of the plasma decreased from 4.96 × 1023m‐3 to approximately 1.1 × 1021m‐3, while the electron temperature dropped from approximately 51,500 K to 6900 K. The plasma images and the measured distribution of the electron number density and temperature indicated the formation of a toroidal structure approximately 18 μs after plasma generation. The Rayleigh scattering results show that the Taylor-Sedov model cannot well describe the early...
  • Idioma: Inglês

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