Atmospheric helium capillary dielectric barrier discharge for soft ionization: broadening of spectral lines, gas temperature and electron number density

2014 ◽  
Vol 29 (3) ◽  
pp. 498-505 ◽  
Author(s):  
Vlasta Horvatic ◽  
Saskia Müller ◽  
Damir Veza ◽  
Cedomil Vadla ◽  
Joachim Franzke
Keyword(s):  
Dielectric Barrier Discharge ◽  
Electron Number Density ◽  
Barrier Discharge ◽  
Spectral Lines ◽  
Number Density ◽  
Gas Temperature ◽  
Electron Number ◽  
Dielectric Barrier ◽  
Soft Ionization

scholarly journals Influence of the Distance between Focusing Lens and Target Surface on the Characteristics of Laser-excited Lead Plasma

2021 ◽  
pp. 4694-4701
Author(s):  
Qusay Adnan Abbas
Keyword(s):  
Electron Temperature ◽  
Pulse Laser ◽  
Electron Number Density ◽  
Laser Energy ◽  
Pulse Length ◽  
Target Surface ◽  
Spectral Lines ◽  
Stark Broadening ◽  
Number Density ◽  
Electron Number

      The present work investigated the effect of distance from target surface on the parameters of lead plasma excited by 1064nm Q-switched Nd:YAG laser. The excitation was conducted in air, at atmospheric pressure, with pulse length of 5 ns, and at different pulse laser energies. Electron temperature was calculated by Boltzmann plot method based on the PbI emission spectral lines (369.03 nm, 416.98 nm, 523.48, and 561.94 nm). The PbI lines were recorded at different distances from the target surface at laser pulse energies of 260 and 280 mJ. The emission intensity of plasma increased with increasing the lens-to-target distance. The results also detected an increase in electron temperature with increasing the distance between the focal lens and the surface of the target in all laser energies under study. In addition, the electron number density was determined by using the Stark broadening method. The data illustrated that the electron number density was increased with increasing the distance from target surface, reaching the maximum at a distance of 11 cm for all pulse laser energy levels under study.

scholarly journals Measurement of Laser-Induced Plasma: Stark Broadening Parameters of Pb(II) 2203.5 and 4386.5 Å Spectral Lines

2019 ◽  
Vol 73 (2) ◽  
pp. 133-151 ◽  
Author(s):  
Aurelia Alonso-Medina
Keyword(s):  
Yttrium Aluminum Garnet ◽  
Electron Number Density ◽  
Graphical Representation ◽  
Spectral Lines ◽  
Stark Broadening ◽  
Number Density ◽  
Electron Number ◽  
Breakdown Spectroscopy ◽  
Fundamental Wavelength ◽  
And Shifts

In this work, the Stark broadening parameters (widths and shifts) of the 2203.5 Å and 4386.5 Å Pb(II) spectral lines have been investigated and measured in laser-induced breakdown spectroscopy (LIBS), using a lead sample (99.999% purity). A Q-switched neodymium-doped yttrium aluminum garnet (Nd:YAG) laser operating at its fundamental wavelength (10 640 Å), generating pulses of 290 mJ, 7 ns of duration, and a repeat frequency of 20 Hz, has been used for the ablation of said lead sample in vacuum and in a controlled argon atmosphere. A study to understand the expansion dynamics of the lead produced plasma was performed. The spectra have been obtained and measured at different time delays of the plasma evolution in the range of 0.15–9 μs, at which the temperature and electron number density are in the ranges of 28 200–8000 K and 1.3 × 1017 to 3 × 1015 cm−3, respectively. A graphical representation of the evolution of temperature and electron number density versus 0.3 to 6.5 μs delay from the laser pulse is presented. The important effect of the different environment where the plasma expands has been pointed out. Local thermodynamic equilibrium conditions have been checked. The obtained results of the Stark widths and shifts at the different temperatures and densities of electrons have been compared with the limited data available in the literature. This study aims to obtain more accurate values for these parameters and also to establish regularities and similarities for said parameters.

Capillary Dielectric Barrier Discharge: Transition from Soft Ionization to Dissociative Plasma

2016 ◽  
Vol 88 (9) ◽  
pp. 4701-4705 ◽  
Author(s):  
Felix David Klute ◽  
Antje Michels ◽  
Alexander Schütz ◽  
Cedomil Vadla ◽  
Vlasta Horvatic ◽  
...  
Keyword(s):  
Dielectric Barrier Discharge ◽  
Barrier Discharge ◽  
Dielectric Barrier ◽  
Soft Ionization ◽  
Discharge Transition
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