scholarly journals Gas Temperature Distribution in Cathode Fall Region of Grimm Glow Discharge

2018 ◽  
Vol 5 (3) ◽  
pp. 122-124 ◽  
Author(s):  
G. Majstorovic ◽  
M. Vasiljevic ◽  
N. Šišovic
Keyword(s):  
Glow Discharge ◽  
Vibrational State ◽  
Cathode Surface ◽  
Rotational Temperature ◽  
Optical Emission ◽  
Cathode Fall ◽  
Gas Temperature ◽  
Excited Vibrational State ◽  
Boltzmann Plot ◽  
Argon Mixture

Optical emission spectroscopy technique was used to measure gas temperature along the axis of cylindrical abnormal glow discharge parallel to the copper cathode surface (side-on) in hydrogen-argon mixture at low pressure. The rotational temperature of excited state of H<sub>2</sub> was determined from the rotational structure of Q branch of Fulcher-α diagonal bands using Boltzmann plot technique while the obtained ground vibrational state temperature is assumed to be equal to gas temperature. The temperature T<sub>0</sub> determined from the rotational population density distribution in an excited vibrational state can be considered as a valid estimation of the ground state temperatutre i.e. H<sub>2</sub> gas temperature.

scholarly journals Rotational and gas temperatures of molecular deuterium in a hollow cathode glow discharge

2015 ◽  
Vol 38-39 (1) ◽  
pp. 11-22 ◽  
Author(s):  
G. Lj. Majstorović ◽  
N. M. Šišović
Keyword(s):  
Glow Discharge ◽  
Hollow Cathode ◽  
Low Voltage ◽  
Rotational Temperature ◽  
Energy Levels ◽  
Optical Emission ◽  
Gas Temperature ◽  
Line Intensities ◽  
Relative Line ◽  
Deuterium Molecule

Abstract We report the results of optical emission spectroscopy measurements of rotational Trot and translational (gas) temperature of deuterium molecules. The light source was a low-voltage high-pressure hollow cathode (HC) glow discharge with titanium cathode operated in deuterium. The rotational temperature of excited electronic states of D2 was determined from the intensity distribution in the rotational structure of Q-branches of the two Fulcher-α diagonal bands: [ν′ = ν″ = 2] and [ν′ =ν″ = 3]. The population of the excited energy levels, determined from relative line intensities, was used to derive the radial distributions of the temperature of the excited and the ground state of the deuterium molecule.

Experimental Study on the Effect of Different Noble Gas Admixtures on the Gas Temperature of Oxygen Plasma

2005 ◽  
Vol 8 (1) ◽  
Author(s):  
K. Naoi ◽  
T. Sakamoto ◽  
H. Matsuura ◽  
H. Akatsuka
Keyword(s):  
Oxygen Plasma ◽  
Rotational Temperature ◽  
Noble Gas ◽  
Optical Emission ◽  
Radiative Transition ◽  
Band Spectrum ◽  
Gas Temperature ◽  
Inner Diameter ◽  
Discharge Pressure ◽  
Gas Admixtures

AbstractWe measured rotational temperature of oxygen plasma by optical emission spectroscopy (OES) in order to examine approximate value of its gas temperature. We generated microwave discharge oxygen plasma in a cylindrical quartz tube whose inner diameter 26 mm with its discharge pressure 0.5 - 2.0 Torr. We measured the band spectrum of radiative transition A

Influence of Heavy Particle Collision on Optical Emission in Cathode Fall of DC Argon/Silane Glow Discharge

1994 ◽  
Vol 33 (Part 1, No. 7B) ◽  
pp. 4357-4360 ◽  
Author(s):  
Yoshinobu Matsuda ◽  
Kazumi Ano ◽  
Hiroharu Kawasaki ◽  
Hiroshi Fujiyama
Keyword(s):  
Glow Discharge ◽  
Heavy Particle ◽  
Optical Emission ◽  
Particle Collision ◽  
Cathode Fall

Optogalvanic Measurement of the Electric Field inside the Cathode Fall Region of Neon Hollow Cathode Discharge

1989 ◽  
Vol 43 (2) ◽  
pp. 245-248 ◽  
Author(s):  
Norihiro Ami ◽  
Akihide Wada ◽  
Yukio Adachi ◽  
Chiaki Hirose
Keyword(s):  
Glow Discharge ◽  
Electric Field ◽  
Hollow Cathode ◽  
Stark Effect ◽  
Cathode Surface ◽  
Hollow Cathode Discharge ◽  
Cathode Fall ◽  
Negative Glow ◽  
Optogalvanic Spectroscopy ◽  
The Difference

Radial distribution of the electric field in the cathode fall region of neon hollow cathode discharge has been derived through the observation of the linear Stark effect of the nd′ ( n = 10–12)-3 p′[½]1 transitions by two-step optogalvanic spectroscopy. The field strength was found to decrease monotonically from the cathode to the negative glow. The depth of the cathode fall region was 0.80 ± 0.05 mm, and the electric field at the cathode surface was 5.2 ± 0.2 kV/cm*—values which compare with the reported values of around 3–4 mm and 3–4 kV/cm in the cathode fall region of Ne glow discharge. The difference and similarity in the values of derived parameters are discussed.

scholarly journals Spatially-Resolved Spectroscopic Diagnostics of a Miniature RF Atmospheric Pressure Plasma Jet in Argon Open to Ambient Air

Plasma ◽  
2020 ◽  
Vol 3 (2) ◽  
pp. 38-53
Author(s):  
Florent P. Sainct ◽  
Antoine Durocher-Jean ◽  
Reetesh Kumar Gangwar ◽  
Norma Yadira Mendoza Gonzalez ◽  
Sylvain Coulombe ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Atmospheric Pressure ◽  
Rotational Temperature ◽  
Atmospheric Pressure Plasma ◽  
Optical Emission ◽  
Ambient Air ◽  
Level Population ◽  
Optical Absorption Spectroscopy ◽  
Gas Temperature ◽  
Spatially Resolved

The spatially-resolved electron temperature, rotational temperature, and number density of the two metastable Ar 1 s levels were investigated in a miniature RF Ar glow discharge jet at atmospheric pressure. The 1 s level population densities were determined from optical absorption spectroscopy (OAS) measurements assuming a Voigt profile for the plasma emission and a Gaussian profile for the lamp emission. As for the electron temperature, it was deduced from the comparison of the measured Ar 2 p i → 1 s j emission lines with those simulated using a collisional-radiative model. The Ar 1 s level population higher than 10 18 m − 3 and electron temperature around 2.5 eV were obtained close to the nozzle exit. In addition, both values decreased steadily along the discharge axis. Rotational temperatures determined from OH(A) and N 2 (C) optical emission featured a large difference with the gas temperature found from a thermocouple; a feature ascribed to the population of emitting OH and N 2 states by energy transfer reactions involving the Ar 1 s levels.

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