Determination of the number densities of argon metastables in argon-hydrogen plasma by absorption and self-absorption methods

2006 ◽  
Vol 15 (3) ◽  
pp. 391-395 ◽  
Author(s):  
Z Gavare ◽  
D Gött ◽  
A V Pipa ◽  
J Röpcke ◽  
A Skudra
Keyword(s):  
Hydrogen Plasma

A Chemical Perspective of GaN Polarity: The use of Hydrogen Plasma Dry Etching Versus NaOH Wet Etching to Determine Polarity

2002 ◽  
Vol 722 ◽  
Author(s):  
Maria Losurdo ◽  
MariaMichela Giangregorio ◽  
Pio Capezzuto ◽  
Giovanni Bruno ◽  
Gon Namkoong ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Plasma Etching ◽  
Hydrogen Plasma ◽  
Dry Etching ◽  
Surface Reactivity ◽  
Wet Etching ◽  
Hydrogen Treatment

AbstractThe use of dry hydrogen plasma etching is evaluated for determination of GaN polarity and critically compared to wet etching in NaOH. It is shown that hydrogen plasma etching is effective in revealing inversion domains (IDs) and some types of dislocations. This is because the surface morphology is unchanged by the hydrogen treatment, and, hence, the surface reactivity is not masked.

Experimental and theoretical determination of the efficiency of a sub-atmospheric flowing high power cascaded arc hydrogen plasma source

2010 ◽  
Vol 19 (6) ◽  
pp. 065016 ◽  
Author(s):  
W A J Vijvers ◽  
D C Schram ◽  
A E Shumack ◽  
N J Lopes Cardozo ◽  
J Rapp ◽  
...  
Keyword(s):  
High Power ◽  
Hydrogen Plasma ◽  
Plasma Source ◽  
Theoretical Determination

scholarly journals An Investigation of the Composition of a Hydrogen Plasma using Magnetoacoustic Oscillations

1978 ◽  
Vol 31 (6) ◽  
pp. 477 ◽  
Author(s):  
MH Brennan ◽  
BL Jessup ◽  
IR Jones
Keyword(s):  
Particle Density ◽  
Hydrogen Plasma ◽  
Oscillation Amplitude ◽  
Total Flux ◽  
Temperature Profiles ◽  
Atom Number ◽  
Radial Profiles

This paper reports on the use of observations of magnetoacoustic oscillations to determine the radial particle density and temperature profiles in a hydrogen plasma. The observations comprise measurements, at a number of frequencies, of the radial variations of the oscillation amplitude and of the total flux in the plasma. The analysis allows the determination of radial profiles of the ion and atom number densities.

scholarly journals Определение изотопного состава плазмы по частоте альфвеновских колебаний в токамаке ТУМАН-3М

2019 ◽  
Vol 45 (15) ◽  
pp. 51
Author(s):  
Г.И. Абдуллина ◽  
Л.Г. Аскинази ◽  
А.А. Белокуров ◽  
Н.А. Жубр ◽  
В.А. Корнев ◽  
...  
Keyword(s):  
Oscillation Frequency ◽  
Neutral Particle ◽  
Isotope Composition ◽  
Isotopic Ratio ◽  
Hydrogen Plasma ◽  
Analysis Data ◽  
Particle Analysis ◽  
Deuterium Plasma ◽  
Hydrogen Deuterium

The possibility of determination of evolution of the plasma isotope composition from Alfven oscillation frequency in discharges with pulsed deuterium puffing into hydrogen plasma and hydrogen into deuterium plasma in ohmically heated plasma in TUMAN-3M tokamak is discussed. Isotopic ratio found from the Alfven oscillation spectra by this method is relative concentrations of hydrogen nH/(nH+nD) or deuterium nD/(nH+nD) in the mixed hydrogen-deuterium plasma. These values were found to agree qualitatively with the results of optical spectroscopy measurements and with neutral particle analysis data.

Absorption coefficients of a hydrogen plasma for laser radiation

1974 ◽  
Vol 11 (1) ◽  
pp. 111-129 ◽  
Author(s):  
James R. Stallcop
Keyword(s):  
Laser Radiation ◽  
Absorption Coefficient ◽  
Hydrogen Plasma ◽  
Radiation Absorption ◽  
Graphical Form ◽  
Wide Range ◽  
Plasma Absorption ◽  
Common Laboratory ◽  
Absorption Measurements

The formalism for the calculation of the absorption of radiation by a hydrogen plasma at common laboratory conditions is summarized. The hydrogen plasma absorption coefficient for laser radiation has been computed for a wide range of electron densities (1015- 1018 cm-3) and temperatures (10 000–40 000 °K). The results of this computation are presented in a graphical form that permits a determination of the absorption coefficient for the following laser wavelengths: 0.176, 0.325, 0.337, 0.442, 0.488, 0.51, 0.633, 0.694, 1.06, 1.15, 2.36, 3.39, 5.40 and 10.6 Μm. The application of these results and laser radiation absorption measurements to plasma diagnostics is discussed briefly.

scholarly journals Influence of the Doping Level at Boron Doped Nanocrystalline Diamond Films in the Electrochemical Determination of Nitrite

2012 ◽  
Vol 1395 ◽  
Author(s):  
Jorge T. Matsushima ◽  
Diego H.L. Souza ◽  
Fernando A. Souza ◽  
Adriana F. Azevedo ◽  
Mauricio R. Baldan ◽  
...  
Keyword(s):  
Grain Size ◽  
Doping Level ◽  
Hydrogen Plasma ◽  
Electrochemical Determination ◽  
Nanocrystalline Diamond ◽  
Analytical Sensitivity ◽  
Nitrite Oxidation ◽  
Boron Doped ◽  
Pre Treatment

ABSTRACTIn this paper, the influence of the doping level at boron doped nanocrystalline diamond (BDND) films in the electrochemical determination of nitrite was reported. The morphology and the structure modifications as function of the boron doping level increase were observed. Two different doping levels were considered. A BDND film with a doping level of 30.000 ppm and one another with a doping level of 10.000 ppm was used. The columnar growth for the 30.000 ppm BDND led to a higher surface roughness and also to a greater grain size when compared to that 10.000 ppm BDND. The Raman spectra shown higher sp2-bonded carbon amount in grain boundary for the 10.000 ppm BDND film due to decrease of the grain size. The morphological and structural modifications of the BDND films were crucial for nitrite oxidation process. The 30.000 ppm BDND electrode presented a better sensitivity to the nitrite oxidation and a lower detection limit (DL) on the “as-grown” condition, while the 10.000 ppm BDND electrode presented a better analytical sensitivity and a lower DL after the surface pre-treatment with hydrogen plasma.

scholarly journals Determination of Physicomechanical Characteristics of the Cement Mortar with Added Fiberglass Waste Treated with Hydrogen Plasma

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1718
Author(s):  
Marius Lucian Lupu ◽  
Dorina Nicolina Isopescu ◽  
Ioan Tuns ◽  
Ioana-Roxana Baciu ◽  
Sebastian George Maxineasa
Keyword(s):  
Raw Materials ◽  
Hydrogen Plasma ◽  
Construction Sector ◽  
Economic Activities ◽  
Gaseous State ◽  
Synthetic Fuel ◽  
Physicomechanical Characteristics ◽  
Global Priority ◽  
Innovative Solution

Solving the environmental problems and the economic aspects of the construction sector represent a global priority. The considerable quantities of raw materials and the energy consumed by this sector make it one of the most polluting economic activities. Fiberglass in various forms is widely used in the construction sector. In the manufacturing process and during the usage of fiberglass products, a significant amount of indestructible waste results, negatively impacting the environment. An innovative solution for utilizing this type of waste is the treatment with hydrogen plasma. This process results in two products: the first in the gaseous state used to obtain synthetic fuel and the second in solid-state, named slag. The composition of solid waste contains chemical compounds that can increase their strength if used as additives in mortars or concretes. This study presents the laboratory tests on mortars, in which a part of the cement amount was replaced with the solid component resulting from the plasma treatment of glass fiber waste. The results showed that replacing a part of the cement with these materials is a solution that minimizes the ecological footprint of the buildings.

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