Space resolved density measurements of argon and helium metastable atoms in radio-frequency generated He-Ar micro-plasmas

Niermann, Benedikt; Böke, Marc; Sadeghi, N.; Winter, J.

doi:10.1140/epjd/e2010-00166-8

Cited by 103 publications

(107 citation statements)

References 16 publications

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“…The line is significantly shifted compared to its position under low pressure and low electron density conditions. The shift is about 3.3 GHz to longer wavelength, which is almost 2 GHz more than in α-mode glow discharges at atmospheric pressure [18]. Due to high electron densities in the filaments, the shift must probably be attributed to Stark effects.…”

Section: Spectroscopic Setupmentioning

confidence: 80%

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Argon metastable dynamics in a filamentary jet micro-discharge at atmospheric pressure

Niermann¹,

Reuter²,

Kuschel³

et al. 2012

Plasma Sources Sci. Technol.

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Abstract.Space and time resolved concentrations of Ar ( 3 P 2 ) metastable atoms at the exit of an atmospheric pressure radio-frequency micro-plasma jet were measured using tunable diode laser absorption spectroscopy. The discharge features a coaxial geometry with a hollow capillary as an inner electrode and a ceramic tube with metal ring as outer electrode. Absorption profiles of metastable atoms as well as optical emission measurements reveal the dynamics and the filamentary structure of the discharge. The average spatial distribution of Ar metastables is characterized with and without a target in front of the jet, showing that the target potential and therewith the electric field distribution substantially changes the filaments' expansion. Together with the detailed analysis of the ignition phase and the discharge's behavior under pulsed operation, the results give an insight into the excitation and de-excitation mechanisms.

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Section: Spectroscopic Setupmentioning

confidence: 80%

“…A more detailed insight into the density calculations is given in [18]. Additionally the light emission profile of the discharge effluent is recorded with an ICCD camera (Andor, iStar DH734-18F-03) in the visible spectral range.…”

Section: Spectroscopic Setupmentioning

confidence: 99%

Argon metastable dynamics in a filamentary jet micro-discharge at atmospheric pressure

Niermann¹,

Reuter²,

Kuschel³

et al. 2012

Plasma Sources Sci. Technol.

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“…However, Ar APPJs are often filamentary, and the accurate mapping of Ar m absolute densities is therefore challenging. Different works have shown that this can be achieved using TDLAS in specific APPJ configurations . However, the vast majority of published studies refer to APPJs driven mostly by rf or kHz‐sinusoidal voltages without studying the effect of different targets.…”

Section: Introductionmentioning

confidence: 99%

Ar(1s₅) absolute radial densities in a ns‐pulsed argon plasma jet impinging on dielectric targets at floating potential – plasma action on organic molecules

Vazquez

Alhomsi

Bauville

et al. 2018

Plasma Processes & Polymers

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The present work is devoted to the precise spatiotemporal mapping of the absolute density of Ar(1s5) in a ns‐pulsed argon plasma jet. The plasma impinges on glass and alumina targets at floating potential placed 5 mm away from the reactor's nozzle. Under these conditions, diffuse discharges are established in the small gas gap. As so, the line‐of‐sight absolute density of Ar(1s5) is effectively evaluated via laser absorption spectroscopy. The application of the Abel‐inversion is also demonstrated for different operating conditions leading to the precise radial mapping of the Ar(1s5) absolute density. The influence of each target is studied for two gas flow rates, 0.3 and 0.4 l min−1. The temporal density profiles over a voltage pulse period reveal two maxima related with the Ar(1s5) production in the streamer head and in the residual diffuse plasma channel. Furthermore, the maximum Ar(1s5) axial/radial density (∼1013 − 3.5 × 1014 cm−3) depends on the target material and gas flow rate. Finally, the plasma is proved to be very effective for the fast desorption of organic molecules (bibenzyl) deposited on both targets. The results obtained suggest that the desorption of bibenzyl is due to the production of high Ar(1s5) densities at the close vicinity of the targets.

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“…Candidiasis, caused by Candida species, is the most common fungal infection in humans and animals. Candida albicans is considered the most prevalent fungal biofilmforming pathogen that causes life-threatening infections by colonizing polymers used in medical devices [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Influence of a plasma jet on the viability of Candida albicans

et al. 2014

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A rapid growth of interest in low temperature plasma in medicine in recent years has given a rise to a number of different applications. We report a low cost kHz driven argon plasma jet with flow rate less than 0.15 L min -1 suitable for treatment of small areas infected with the wide-spread yeast pathogen Candida albicans. The plasma jet has been applied for inactivation of C. albicans seeded on an agar surface as well as yeast suspensions. The effects of different treatment parameters (gas composition, distance and treatment time) have been studied on the efficiency of yeast inactivation. C. albicans viability was evaluated by XTT assay and by measuring diameters of circular transparent zones.

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Space resolved density measurements of argon and helium metastable atoms in radio-frequency generated He-Ar micro-plasmas

Cited by 103 publications

References 16 publications

Argon metastable dynamics in a filamentary jet micro-discharge at atmospheric pressure

Argon metastable dynamics in a filamentary jet micro-discharge at atmospheric pressure

Ar(1s₅) absolute radial densities in a ns‐pulsed argon plasma jet impinging on dielectric targets at floating potential – plasma action on organic molecules

Influence of a plasma jet on the viability of Candida albicans

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Space resolved density measurements of argon and helium metastable atoms in radio-frequency generated He-Ar micro-plasmas

Cited by 103 publications

References 16 publications

Argon metastable dynamics in a filamentary jet micro-discharge at atmospheric pressure

Argon metastable dynamics in a filamentary jet micro-discharge at atmospheric pressure

Ar(1s5) absolute radial densities in a ns‐pulsed argon plasma jet impinging on dielectric targets at floating potential – plasma action on organic molecules

Influence of a plasma jet on the viability of Candida albicans

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Ar(1s₅) absolute radial densities in a ns‐pulsed argon plasma jet impinging on dielectric targets at floating potential – plasma action on organic molecules