Electron density measurement in atmospheric pressure plasma jets: Stark broadening of hydrogenated and non-hydrogenated lines

Nikiforov, Anton; Leys, Ch.; González, Manuel Á.; Walsh, James L.

doi:10.1088/0963-0252/24/3/034001

Cited by 198 publications

(199 citation statements)

References 137 publications

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“…This leads to typical order of magnitude for the ionization degree of 10 −7 , emphasising strong differences in comparison with low pressure discharges. These values are in general underestimated in comparison with other measurements such as Stark broadening of hydrogen lines [54], Thomson scattering of laser radiation [55,56] or Rayleigh microwave scattering [57], mainly due to difficulty of finding correct values for drift velocity. Although the electron density estimation from plasma column current monitoring is only a rough method, other issues related mainly to experimental design of the plasma sources must be considered in order to compare experimental results.…”

Section: Plasma Source Quasi-stationary Working Regimementioning

confidence: 80%

Time Behaviour of Helium Atmospheric Pressure Plasma Jet Electrical and Optical Parameters

et al. 2017

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Low temperature plasma jets gained increased interest in the last years as a potential device in many life science applications, including here human or veterinary medicine. Standardisation of plasma sources and biological protocols are necessary for quality assurance reasons, due to the fact that this type of atmospheric pressure plasma source is available in multiple configurations and their operational parameters span also on a broad range of items, such as all characteristics of high voltage pulses used for gas breakdown, geometrical characteristics, gas feed composition and conductive or biological target characteristics. In this paper we present results related to electrical, optical and molecular beam mass spectrometry diagnosis of a helium plasma jet, emphasising the influence of various operational parameters of the high voltage pulses on plasma jet properties. Discussion on physical parameters that influence the biological response is included, together with important results on plasma sources statistical behaviour until reaching a quasi-stationary working regime. The warm-up period of the plasma jet, specific to many other plasma sources, must be precisely known and specified whenever the plasma jets are used as a tool for life science applications.

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Section: Plasma Source Quasi-stationary Working Regimementioning

confidence: 80%

Time Behaviour of Helium Atmospheric Pressure Plasma Jet Electrical and Optical Parameters

et al. 2017

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“…As the tube diameter increases from 9 to 100 µm, the Stark broadening width decreases significantly from 1.217 to 0.352 nm. According to the reference, the relationship between the Stark broadening (

Δ λ_{s}

) and the electron density ( n e ) can be described as,

n_{e} = 10^{17} \times {(Δ λ_{s} /1.098)}^{1.47135}

…”

Section: Resultsmentioning

confidence: 99%

The effects of the tube diameter on the discharge ignition and the plasma properties of atmospheric‐pressure microplasma confined inside capillary

Liu

et al. 2019

Plasma Processes & Polymers

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With plasma penetration into a capillary and the assistant of an air DBD, an ac‐driven Ar microplasma plume having a length of several cm is generated inside the capillary. The inner diameter of the capillary ranges from 4 to 100 µm. When the tube diameter decreases, the length of the microplasma plume decreases, and while the ignition voltage, the current density, and the electron density increase significantly. For the tube diameter of 9 µm, the current density and the electron density measured from the Stark broadening of Hα line reach as high as 109 A m−2 and 11 × 1016 cm−3, respectively. The microplasma plume is of high degree of ionization and remains non‐thermal. Rather than monotonically increasing, the propagation velocity of the microplasma plume decreases and then keeps almost unchanged after the tube diameter reaches 20 µm.

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“…Hence, it can be used to determine the plasma density, n e . The hydrogen Balmer series (H b ) is usually used to obtain the plasma electron density without considering the fine structure of the emission lines and plasma ions dynamics [55,57]. On the other hand, the Full-Width at Half-Maximum (FWHM) is used to determine the broadened emission line profile.…”

Section: Analysis Of Resultsmentioning

confidence: 99%

A pulsed plasma jet with the various Ar/N2 mixtures

et al. 2017

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In this paper, using the Optical Emission Spectroscopy technique, the physical properties of a fabricated pulsed DBD plasma jet are studied. Ar/N 2 gaseous mixture is taken as operational gas, and Ar contribution in Ar/N 2 mixture is varied from 75 to 95%. Through the optical emission spectra analysis of the pulsed DBD plasma jet, the rotational, vibrational and excitation temperatures and density of electrons in plasma medium of the pulsed plasma jet are obtained. It is seen that, at the wavelength of 750.38 nm, the radiation intensity from the Ar 4p ? 4 s transition increases at the higher Ar contributions in Ar/N 2 mixture. It is found that, for 95% of Ar presence in the mixture, the emission intensities from argon and molecular nitrogen are higher, and the emission line intensities will increase nonlinearly. In addition, it is observed that the quenching of Ar * by N 2 results in the higher intensities of N 2 excited molecules. Moreover, at the higher percentages of Ar in Ar/N 2 mixture, while all the plasma temperatures are increased, the plasma electron density is reduced.

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Electron density measurement in atmospheric pressure plasma jets: Stark broadening of hydrogenated and non-hydrogenated lines

Cited by 198 publications

References 137 publications

Time Behaviour of Helium Atmospheric Pressure Plasma Jet Electrical and Optical Parameters

Time Behaviour of Helium Atmospheric Pressure Plasma Jet Electrical and Optical Parameters

The effects of the tube diameter on the discharge ignition and the plasma properties of atmospheric‐pressure microplasma confined inside capillary

A pulsed plasma jet with the various Ar/N2 mixtures

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