Temporary spectral analysis of a laser plasma of mineral coal

2nd International Meeting for Researchers in Materials and Plasma Technology

物理学;材料科学

Rebolledo, P.^1 ; Pacheco, P.^1 ; Sarmiento, R.^1 ; Cabanzo, R.^2 ; Mejía-Ospino, E.^2

Grupo de Espectroscopía Óptica de Emisión y Laser-GEOEL, Universidad Del Atlántico, Barranquilla, Colombia^1

Grupo de Espectroscopía Atómica y Molecular-LEAM, Universidad Industrial de Santander, Bucaramanga, Colombia^2

关键词: Energy per pulse;    Laserinduced breakdown spectroscopy (LIBS);    ND : YAG lasers;    Plasma radiation;    Spectral range;    Spectral studies;    Target pellet;    Vibrational temperature;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/466/1/012015/pdf
DOI  :  10.1088/1742-6596/466/1/012015

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In this work we present results of the temporal spectral study of a plasma laser of mineral coal using the Laser-induced Breakdown Spectroscopy (LIBS) technique. The plasma was generated by focusing a laser beam of Nd:YAG laser emitting at 532 nm with energy per pulse of 35 mJ on coal target pellets. The plasma radiation was conducted by an optical fiber to the entrance slit of a spectrograph of 0.5 m, equipped with a 1200 and 2400 grooves/mm diffraction grating and an ICCD camera for registration with different delay times of the spectra in the spectral range from 250 nm to 900 nm. The temporal spectral analysis allowed the identification of the elements Al, Fe, Ca, Mg, K, and Si, and CN and C2 molecules present in natural coals. The characteristics of the spectral lines and bands were studied at different delay times obtaining the calculation of the evolution of electron temperature, electron density, and vibrational temperature of plasmas in the time. The delay times used were between 0.5 μs and 5 μs, calculating the electron temperature ranged between 5 000 K and 1 000 K.