Please use this identifier to cite or link to this item: https://physrep.ff.bg.ac.rs/handle/123456789/147
Title: Laser induced plasma expansion and existence of local thermodynamic equilibrium
Authors: Skočić, Miloš 
Bukvić, Srđan 
Keywords: Laser induced plasma;LIBS;LTE;Monte Carlo simulation;Radially resolved spectroscopy
Issue Date: 1-Nov-2016
Journal: Spectrochimica Acta - Part B Atomic Spectroscopy
Abstract: 
In this paper we present a simple model of the laser induced plasma (LIP) expansion in a low pressure surrounding atmosphere. The model is based on assumption that expansion process is dominantly governed by kinematics of the heavy particles. The model is accompanied with a simple, yet effective, Monte-Carlo simulation. Results of the simulation are compared with spectroscopic measurements of the laser induced copper plasma expanding in low pressure (200 Pa) hydrogen atmosphere. We found that characteristic expansion time of the LIP is proportional to the linear dimension of the initial volume heated up by the laser. For sufficiently large initial volume copper plasma remains in local thermodynamic equilibrium on the submicrosecond-microsecond scale. It is shown that diagnostics based on the spectral lines of the hydrogen atmosphere is not suitable for characterization of the core of the copper plasma. We have demonstrated importance of radially resolved spectroscopic measurements as a key step for correct diagnostics and understanding of laser induced plasma.
URI: https://physrep.ff.bg.ac.rs/handle/123456789/147
ISSN: 0584-8547
DOI: 10.1016/j.sab.2016.09.011
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