Nonhomogeneous surface properties of parylene-C film etched by an atmospheric pressure He/O2 micro-plasma jet in ambient air

2016 ◽  
Vol 383 ◽  
pp. 261-267 ◽  
Author(s):  
Tao Wang ◽  
Bin Yang ◽  
Xiang Chen ◽  
Xiaolin Wang ◽  
Chunsheng Yang ◽  
...  
Keyword(s):  
Surface Properties ◽  
Atmospheric Pressure ◽  
Plasma Jet ◽  
Ambient Air ◽  
Parylene C

Expansion dynamics of atmospheric pressure helium plasma jet in ambient air

2020 ◽  
Vol 384 (19) ◽  
pp. 126497 ◽  
Author(s):  
G. Veda Prakash ◽  
Kiran Patel ◽  
Narayan Behera ◽  
Ajai Kumar
Keyword(s):  
Atmospheric Pressure ◽  
Plasma Jet ◽  
Ambient Air ◽  
Helium Plasma

Electrical and spectral property of cold arc plasma at atmospheric pressure

2012 ◽  
Vol 78 (6) ◽  
pp. 617-620
Author(s):  
YUAN ZHONG-CAI ◽  
SHI JIA-MING ◽  
CHEN ZONG-SHENG ◽  
XU BO
Keyword(s):  
Atmospheric Pressure ◽  
Arc Discharge ◽  
Rotational Temperature ◽  
Molecular Nitrogen ◽  
Atmospheric Pressure Plasma ◽  
Emission Spectra ◽  
Optical Emission ◽  
Plasma Jet ◽  
Ambient Air ◽  
Arc Plasma

AbstractAn atmospheric pressure plasma jet is generated with a cold arc discharge in ambient air. The current-voltage characteristics and optical emission spectra of plasma discharges are investigated. The molecular nitrogen (N2), hydroxyl radical (OH), and oxygen atom (O) are observed and analyzed. Based on the best fit of the simulated spectra of N2 (C3∏u+ − B3∏g+) band and OH (A2∑+ − X2∏) band transition and the experimentally recorded spectra, the rotational temperature and the vibrational temperature of atmospheric pressure cold arc plasma jet (APCAPJ) are estimated.

scholarly journals Laser-induced photodetachment of negative oxygen ions in the spatial afterglow of an atmospheric pressure plasma jet

2022 ◽  
Author(s):  
Tim Jacobus Adrianus Staps ◽  
Tim Jacobus Maria Donders ◽  
Bart Platier ◽  
J Beckers
Keyword(s):  
Electron Density ◽  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Negative Ions ◽  
Plasma Jet ◽  
Ambient Air ◽  
Microwave Cavity ◽  
Oxygen Mixture ◽  
Atmospheric Pressure Plasma Jet ◽  
Pressure Plasma

Abstract Negative ions are an important constituent of the spatial afterglow of atmospheric pressure plasmas, where the fundamental plasma-substrate interactions take place that are vital for applications such as biomedicine, material synthesis, and ambient air treatment. In this work, we use laser-induced photodetachment to liberate electrons from negative ions in the afterglow region of an atmospheric pressure plasma jet interacting with an argon-oxygen mixture, and microwave cavity resonance spectroscopy (MCRS) to detect the photodetached electrons. This diagnostic technique allows for the determination of the electron density and the effective collision frequency before, during and after the laser pulse was shot through the measurement volume with nanosecond time resolution. From a laser saturation study, it is concluded that O− is the dominant negative ion in the afterglow. Moreover, the decay of the photodetached electron density is found to be dominantly driven by the (re)formation of O− by dissociative attachment of electrons with O2. As a consequence, we identified the species and process responsible for the formation of negative ions in the spatial afterglow in our experiment.

Active species evolution in presence of different targets impacted by helium plasma jet at atmospheric pressure

2021 ◽  
Author(s):  
Julien Cosimi ◽  
Nofel Merbahi ◽  
Frederic Marchal ◽  
Olivier Eichwald ◽  
Mohammed Yousfi
Keyword(s):  
Atmospheric Pressure ◽  
Pure Water ◽  
Target Surface ◽  
Plasma Jet ◽  
Ambient Air ◽  
Active Species ◽  
Ionization Wave ◽  
Surface Ionization ◽  
Turbulent Regime ◽  
Ultra Pure Water

Abstract A low-temperature plasma jet is generated by a dielectric barrier discharge poweredby a pulsed high voltage in helium flow (3 L/min) at atmospheric pressure inpresence of different targets (glass slide or ultra-pure water or a grounded metal plate)positioned perpendicular to the plasma propagation axis. Experimental electricalcharacterizations as discharge current, voltage and powerand optical ones as intensifiedcamera ICCD, Schlieren imaging and emission spectroscopy to follow specific excitedspecies have been achieved. The transition from laminar to turbulent regime wereobserved during the discharge ignition with a larger spreading of the plasma on thesurface target with lower dielectric permittivity and the generation of two dischargesduring each voltage pulse is highlighted during the propagation of the ionization wavethat has shown a variable speed along the plasma axis not depending on the target kind.The evolution of some active species (as OH, O and excited nitrogen and helium) areinvestigated using time resolved mapping of the emissions of radiative excited speciespropagating in ambient air between the plasma jet output andthe target. For a lowrelative permittivity target (glass), the volume ionization wave at its arrival on thetarget spreads on its surface thus behaving as a surface ionization wave. For thehighest relative permittivity (metal), a conductive channel appears between the targetsurface and the plasma jet during the first discharge, followed by a diffuse plasma plumefrom the target surface towards the plasma jet after the impact of the ionization waveon the target. A hybrid behavior is highlighted for the ultra-pure water which leadsto a short spreading of the ionization wave on the target surface, the formation of aconductive channel in ambient air between tube output and target and the formationof a plasma plume on the target surface.

Localized DLC etching by a non-thermal atmospheric-pressure helium plasma jet in ambient air

2014 ◽  
Vol 50 ◽  
pp. 91-96 ◽  
Author(s):  
Jun-Seok Oh ◽  
Yoshiaki Kakuta ◽  
Yuki Yasuoka ◽  
Hiroshi Furuta ◽  
Akimitsu Hatta
Keyword(s):  
Atmospheric Pressure ◽  
Plasma Jet ◽  
Ambient Air ◽  
Helium Plasma
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