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Measurement of plasma parameters of Calcium and Silicon in a Rock Sample Using Laser Induced Breakdown Spectroscopy

光谱学与光谱分析 2017年第10期37卷 3266-3269页

作者： Uzma G M.Junaid Khalid Alamgir T Samina Department of Physics University of Wah NINVAST National Centre of PhysicsQuaid-e-Azam University

Laser Induced Breakdown Spectroscopic(LIBS)technique was used to detect calcium and silicon in an unknown *** this method plasma was generated by Nd∶YAG laser of wavelength 1 064 nm with energy 400 mJ and pulse duration between 5~*** method was applied for the qualitative as well as quantitative *** the qualitative analysis,the electron number density(Ne)of plasma containing calcium and silicon is determined showing that Neof neutral particles is equivalent to 1016(cm-3)whereas for ionized particles it is 1017(cm-3).plasma temperature is measured using Boltzmann plot method which must be greater than 10 000 *** ratio method is used for the quantitative analysis shows various elements in abundance with calcium and silicon in majority.

关键词： LIBS plasma parameter Quantitative analysis Qualitative analysis

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Laser-induced plasma electron number density:Stark broadening method versus the Saha-Boltzmann equation

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plasma Science and Technology 2017年第2期19卷 43-51页

作者： Arnab SARKAR Manjeet SINGH Fuel Chemistry Division Bhabha Atomic Research CentreMumbai 400 085India

We report spectroscopic studies on plasma electron number density of laser-induced plasma produced by ns-Nd：YAG laser light pulses on an aluminum sample in air at atmospheric pressure. The effect of different laser energy and the effect of different laser wavelengths were compared. The experimentally observed line profiles of neutral aluminum have been used to extract the excitation temperature using the Boltzmann plot method, whereas the electron number density has been determined from the Stark broadened as well as using the Saha-Boltzmann equation （SBE）. Each approach was also carried out by using the AI emission line and Mg emission lines. It was observed that the,SBE method generated a little higher electron number density value than the Stark broadening, method, but within the experimental uncertainty range. Comparisons of Ne determined by the two methods show the presence of a linear relation which is independent of laser energy or laser wavelength. These results show the applicability of the SBE method for Are determination, especially when the system does not have any pure emission lines whose electron impact factor is known, Also use of Mg lines gives superior results than Al lines.

关键词： plasma parameter laser induced plasma plasma electron density Saha-Boltzmannmethod Stark broadening method

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Time-resolved evaluation of uranium plasma in different atmospheres by laser-induced breakdown spectroscopy

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plasma Science and Technology 2018年第12期20卷 65-74页

作者： Manjeet SINGH Arnab SARKAR Fuel Chemistry Division Bhabha Atomic Research CentreMumbai 400 085India Homi Bhabha National Institute AnushaktinagarMumbai 400 094India

This work reports spectroscopic studies of uranium containing plasma generated in air and argon environments. The 532 nm Q-switched Nd：YAG laser generates the optical breakdown plasma, which was recorded by a spectrometer and an intensified charge coupled device having a resolution of 25 pm. Neutral and ionized uranium lines in the wavelength range of 385.8-391.9 nm indicate significant width and shift variations during the first few microseconds. Electron temperature and density of the plasma are determined using the Boltzmann plot and the Saha-Boltzmann equation at various time delay. The study reveals the power law decay pattern of electron temperature and density, which changes to exponential decay pattern if large gate- width is used to acquire the signal, due to an averaging effect.

关键词： uranium laser induced plasma plasma parameter temporal evaluation electron temperature electron density LIBS

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