Optical emission spectroscopy diagnostics of an atmospheric pressure direct current microplasma jet

Sismanoglu, Bogos Nubar; Amorim, J.; Souza-Corrêa, J A; Oliveira, Carlos Yure B.; Gomes, Marcelo Pego

doi:10.1016/j.sab.2009.10.006

Cited by 39 publications

(35 citation statements)

References 30 publications

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“…The main mechanisms responsible for Hα, Hβ, Ar 603.213 and 565.070 nm lines broadenings were previously investigated [9]. The full-width at half-maximum (FWHM) for these lines are given in borehole was focused onto the optical fiber 1mm i.d.…”

Section: Experimental Set-upmentioning

confidence: 99%

“…The apparatus function was obtained from Ar low-pressure lamp and found to be 0.0463 nm. The main mechanisms responsible for Hα, Hβ, Ar 603.213 and 565.070 nm lines broadenings were previously investigated [9]. The full-width at half-maximum (FWHM) for these lines are given in The main mechanisms responsible for H α , H β , Ar 603.213 and 565.070 nm lines broadenings were previously investigated [9].…”

Section: Experimental Set-upmentioning

confidence: 99%

“…The rotational temperature (T rot ) was measured by using the OH(A 2 Σ + , ν = 0 → X 2 Π, ν = 0) emission band at 306.357 nm [9]. The OH radical emissions in atmospheric pressure plasma are result of water vapor naturally present as impurity in the gas and can be formed by electron impact dissociation (e(> 4.4eV )+H 2 O → H + OH).…”

Section: Experimental Set-upmentioning

confidence: 99%

“…Following Schoenbach group studies about microdischarges -notably of microhollow cathode discharges (MHCD) at moderate to atmospheric pressure -the operation and applications of these kinds of microplasmas has attracted the attention of researchers worldwide due to the convenience and easiness of operation, besides the low cost [1][2][3][4][5][6][7][8][9][10]. These non-thermal microplasmas, where the electron temperature is much higher than the gas temperature (here, electron temperature is associated with the mean electron energy), allied to small size and low power consumption, is an attractive to the plasma applications possibilities in industry, like surface treatment, generation of UV and VUV radiation, reduction of pollutants, gas lasers, biological decontamination, thin film deposition, mainly in a high pressure operation [1,2].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Optical and electrical diagnostics of microdischarges at moderate to high pressure in argon

Sismanoglu¹,

Cunha²,

Gomes³

et al. 2010

Braz. J. Phys.

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Microdischarges at moderate to high pressure in argon were investigated. A hole opening diameter of 500 µm direct current (dc) microhollow cathode discharges (MHCD) were characterized by electrical measurements and optical emission spectroscopy (OES) for pressures ranging between 90 and 800 Torr and current from 5 to 20 mA. Current-voltage characteristic curves were obtained as a function of the pressure for this hole diameter. MHCD enables stable dc discharges for molybdenum electrodes material at constant Ar + 2%H 2 flow of 0.03 /min. Optical emission spectroscopy and analysis of the spectral line broadening of plasma line emissions were performed in order to measure gas discharge parameters. Electron number densities were obtained from H β Balmer line (∼ 10 14 cm −3 ). For the above mentioned discharge conditions, gas temperature was estimated to be 550 -850 K from OH rotational bands. Excitation temperature was measured based on two lines method (from atomic Mo lines) and from 4p -4s and 5p -4s Ar radiative transitions. Hydrogen atom temperature was measured for 800 Torr (∼ 12000 K).

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Section: Experimental Set-upmentioning

confidence: 99%

Section: Experimental Set-upmentioning

confidence: 99%

Section: Experimental Set-upmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optical and electrical diagnostics of microdischarges at moderate to high pressure in argon

Sismanoglu¹,

Cunha²,

Gomes³

et al. 2010

Braz. J. Phys.

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“…Further, the unique reactions occurring in atmospheric-pressure plasma are attracting considerable attention. Atmospheric-pressure plasma has been studied extensively [5] and is used in the areas of biotechnology, medical treatment [6][7][8][9][10], remediation of pollutants [7,11], nanotechnology [12,13], and surface processing [14,15]. C. Oliveira et al [14] investigated an argon-hydrogen atmospheric pressure microplasma jet for the treatment of materials, they clarified that Ar-H 2 microplasma jet powered by a commercial RF power source was employed to generate long non-thermal microplasma reaching up to 30 mm, which may be a suitable source of active chemical species.…”

Section: Introductionmentioning

confidence: 99%

Influence of gas flow on argon microwave plasma jet at atmospheric pressure

Iio

Yanagisawa

Uchiyama

et al. 2011

Surface and Coatings Technology

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Many kinds of an atmospheric-pressure plasma jet has been developed and used for widespread applications such as a surface treatment and modified. This study focused on the argon atmospheric-pressure microplasma jet generated by discharging of RF power of 2.45GHz microwave. The plasma jet shows sensitivity to surrounding environment; pressure, temperature and gaseous species. It is therefore absolutely imperative that a nature of atmospheric-pressure plasma jet should be understood from a point of fluid dynamics. This study, therefore, focused on the interrelationship between the plasma jet and the working gas.Motion of the plasma jet and the working gas were evaluated by velocity measurement and fast photography. As a result, the unsteady sinusoidal waving motion in the radial direction of a torch was observed. Advection velocity of the plasma in just downstream region of the torch exit increases with the supplying flow rate, and the velocity ratio is in the range of 0.75-0.87.

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Direct Current Atmospheric Pressure Microdischarge Generated between a Miniature Flow Helium Microjet and a Flowing Liquid Cathode

Jamróz

Gręda

2014

Plasma Process. Polym.

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A new miniaturized direct current atmospheric pressure glow microdischarge system (dc‐μAPGD) was studied. The discharge was generated in the open‐to‐air atmosphere between a miniature flow He microjet and a small‐sized flowing liquid cathode of a new compact design. Optical temperatures (rotational, vibrational, and excitation) were determined for the near liquid cathode zone of the microdischarge under conditions of a changing flow rate of He (30–300 sccm). Both, the rotational temperature of OH (2 800–3 850 K) and N2 (1 550–1 900 K) molecules, and the vibrational temperature of OH (2 900–4 000 K) and N2 (3 800–4 200 K) molecules were lower than the excitation temperature of H atoms (4 400–4 600 K). The electron number density determined in these conditions was within the range of (2.0–3.5) × 1014 cm−3. Additionally, concentrations of nitrate, nitrite, and ammonium ions as well as hydrogen peroxide were quantified in the solution of the flowing liquid cathode treated by the studied microdischarge. Changes in the acidity of this solution were also examined.

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Optical emission spectroscopy diagnostics of an atmospheric pressure direct current microplasma jet

Cited by 39 publications

References 30 publications

Optical and electrical diagnostics of microdischarges at moderate to high pressure in argon

Optical and electrical diagnostics of microdischarges at moderate to high pressure in argon

Influence of gas flow on argon microwave plasma jet at atmospheric pressure

Direct Current Atmospheric Pressure Microdischarge Generated between a Miniature Flow Helium Microjet and a Flowing Liquid Cathode

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