Spectral characteristic of laser-induced plasma in soil

Yang YU (余洋); Nanjing ZHAO (赵南京); Zhigao LAN (兰智高); Deshuo MENG (孟德硕); Mingjun MA (马明俊)

doi:10.1088/2058-6272/ab4c6a

Plasma Science and Technology > 2020 > 22(1): 15502-015502. > DOI: 10.1088/2058-6272/ab4c6a

Yang YU (余洋), Nanjing ZHAO (赵南京), Zhigao LAN (兰智高), Deshuo MENG (孟德硕), Mingjun MA (马明俊). Spectral characteristic of laser-induced plasma in soil[J]. Plasma Science and Technology, 2020, 22(1): 15502-015502. DOI: 10.1088/2058-6272/ab4c6a

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Spectral characteristic of laser-induced plasma in soil

¹ College of Physics and Electronic Information, Huang Gang Normal University, Huanggang 438000, People's Republic of China
² Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China

Funds: This work is supported by the Special Project of Knowledge Innovation of Hubei Province (No. 2018CFC862), National Natural Science Foundation of China (No. 61705238), the National High Technology Research and Development Program of China (No. 2014AA06A513).

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Received Date: April 15, 2019
Revised Date: October 06, 2019
Accepted Date: October 07, 2019

Graphical Abstract

Abstract

Abstract

The spectral characteristic of laser-induced plasma in soil was studied in this work, laser-induced breakdown spectroscopy was used to analyze the spectral characteristic of plasma under the condition of different time delays and irradiances. Moreover, the time evolution characteristics of plasma temperature and electron density were discussed. Within the time delay range of 0–5 μs, the spectral intensity of the characteristic lines of Si I: 288.158 nm, Ti I: 336.126 nm, Al I: 394.400 nm and Fe I: 438.354 nm of the four main elements in two kinds of national standard soil decayed exponentially with time. The average lifetime of the spectral lines was nearly 1.56 μs. Under the condition of different time delays, the spectral intensity of Pb I: 405.78 nm in soil increased linearly with laser energy. However, the slope between the spectral intensity and laser energy decreased exponentially with the increase in time delay, from 4.91 to 0.99 during 0–5 μs. The plasma temperature was calculated by the Boltzmann plot method and the electron density was obtained by inversion of the full width at half maximum of the spectrum. The plasma temperature decreased from 8900 K to 7800 K and the electron density decreased from 1.5×10¹⁷ cm⁻³ to 7.8×10¹⁶ cm⁻³ in the range of 0–5 μs.
- LIBS,
- soil,
- delay time,
- laser energy,
- plasma temperature,
- electron density

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References (32)

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