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.

On the use of two hydrogen bands for spectroscopic temperature measurement in a low-pressure gas discharge

2012 ◽  
Vol 36 (1) ◽  
pp. 1-12 ◽  
Author(s):  
G. Lj. Majstorović ◽  
N. M. Šišović
Keyword(s):  
Optical Emission Spectroscopy ◽  
Rotational Temperature ◽  
Energy Levels ◽  
Optical Emission ◽  
Low Pressure ◽  
Line Intensities ◽  
Hydrogen Molecules ◽  
Diagonal Band ◽  
Relative Line ◽  
Titanium Cathode

Abstract We report the results of the optical emission spectroscopy measurements of rotational Trot and translational temperature Ttr of hydrogen molecules. The light source was hollow cathode glow discharge with titanium cathode operated in hydrogen at low pressure. The rotational temperature of excited electronic states of H2 was determined either from the relative line intensities of R branch of the GK → B band or from the P, Q and R-branches of the Fulcher-α diagonal band. The population of excited energy levels, determined from the relative line intensities was used to derive rotational temperature of the ground state of hydrogen molecule.

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.

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

The millimetre wave spectrum of the 13C14N radical in its ground state

1984 ◽  
Vol 62 (12) ◽  
pp. 1248-1253 ◽  
Author(s):  
M. Bogey ◽  
C. Demuynck ◽  
J. L. Destombes
Keyword(s):  
Fine Structure ◽  
Glow Discharge ◽  
Ground State ◽  
Wave Spectrum ◽  
Liquid Nitrogen Temperature ◽  
Millimetre Wave ◽  
Line Intensities ◽  
Relative Line ◽  
Rf Glow Discharge ◽  
Structure Constants

The N = 0→ 1 and N = 1 → 2 transitions of 13C14N have been observed in a rf glow discharge in a CO + N2 + He mixture cooled at liquid nitrogen temperature. The 41 measured frequencies have been used to determine the rotational and fine structure constants as well as the hyperfine structure due to the 13C and 14N nuclei. Relative line intensities have also been calculated with a view to interstellar detection.

scholarly journals The Development of Spark Discharges in Hydrogen

1969 ◽  
Vol 22 (2) ◽  
pp. 155 ◽  
Author(s):  
MC Cavenor ◽  
J Meyer
Keyword(s):  
Glow Discharge ◽  
Low Voltage ◽  
Sudden Change ◽  
Coaxial Cable ◽  
Gas Temperature ◽  
Additional Information ◽  
Spark Discharges ◽  
Current Flows ◽  
Two Stages ◽  
Diffuse Glow

Streak photography has been used to supplement the earlier shutter photo. graphic investigation of Doran and Meyer (1967) using the same coaxial cable discharge circuit. Additional information has also been obtained from measurement of the potential distribution between the electrodes at two stages in the spark development. Redistribution of space charge is shown to give rise firstly to a transient diffuse glow discharge that has a close similarity with a normal d.c. glow discharge. It has also been shown that, even while the diffuse glow discharge expands, a partial constriction occurs in which most of the current flows along a narrow axial column. The resulting maximum in electron density eventually causes a rapid increase in dissociation of molecular hydrogen on the axis of the discharge brought about by a rise in the gas temperature. Owing to its greater electrical conductivity this axial column soon carries the entire current and the discharge becomes filamentary though still being maintained by a high cathode fall field, which exists until a sudden change in the cathode mechanism gives rise to the low voltage arc channel. Both the filamentary glow and arc columns are observed to expand according to an r cc ti law.

Characterization of Hollow-Cathode DC Discharge Growth of Diamond: Rotational Vibronic Emission In A CH4-H2 Discharge

1989 ◽  
Vol 162 ◽  
Author(s):  
H. N. Chu ◽  
A. R. Lefkow ◽  
E. A. Den Hartog ◽  
J. Jacobs ◽  
P. Sandstrom ◽  
...  
Keyword(s):  
Hollow Cathode ◽  
Rotational Temperature ◽  
Optical Emission ◽  
Vibronic Band ◽  
Dc Discharge

ABSTRACTExperiments to study the temperature in the discharge produced using a dc spiral hollow cathode with CH4-H2 as the feed gas have been carried out during the rowth of diamond. Optical emission from the R branch of the 3d1 Σ v-O-2p Σ v-O rotational vibronic band are used to determine a rotational temperature. Limitations of this method 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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