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The Leibniz Institute for Plasma Science and Technology (INP) is the largest non-university institute in the field of low temperature plasmas, their basics and technical applications in Europe. The institute carries out research and development from idea to prototype. The topics focus on the needs of the market. At present, plasmas for materials and energy as well as for environment and health are the focus of interest.

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The spatial density distribution of H2O2 in the effluent of the COST-Jet and the kINPen-sci operated with a humidified helium feed gas - dataset

This work serves to highlight the difference of the distinct spatial distribution of H2O2 (hydrogen peroxide) in the effluent of the kINPen-sci plasma jet and the COST reference microplasma jet (COST Jet) operated with humidified helium. For this purpose, the density of H2O2 has been measured spatially resolved using cavity-enhanced absorption spectroscopy employing continuous wave cavity ring-down spectroscopy (cw-CRDS) with a tunable mid-infrared laser. The average number density of H2O2 in the effluent of the kINPen-sci plasma jet is a factor of two higher than in the effluent of the COST Jet. The distribution of H2O2 in the COST-Jet effluent is initially highly uniform and suggests negligible mixing of H2O2 with the ambient air up to 15 mm from the jet nozzle, although it is rapidly diluted at further distances. In the case of the kINPen-sci plasma jet, the number density of H2O2 has a more pronounced radial distribution close to the nozzle, while the mixing with the ambient air is more gradual at further distances from the nozzle.

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Permanent Identifier (DOI)
Permanent Identifier (URI)
Plasma Source Name
Plasma Source Application
Plasma Source Specification
Plasma Source Properties

The kINPen-sci was operated at a sinusoidal waveform of 860 kHz with a peak-to-peak voltage of 3kV. The COST-Jet was operated at a sinusoidal waveform of 13.56 MHz with a peak-to-peak voltage of 850 V.

Plasma Source Procedure
The symmetry axis of the plasma effluent is defined as the z-axis. For both plasma jets, this position is normalised to the tip of the respective jet’s nozzle, such that the effluent exits the source at z = 0.
Plasma Medium Name
Plasma Medium Properties

Humidified helium containing (3300 +- 100) ppm water at a flow rate of 1 slm at atmospheric pressure.

Plasma Diagnostics Name
Plasma Diagnostics Properties

Spatially resolved measurements of H2O2 number densities in the effluent of both plasma jets:
The optical cavity is composed of two highly reflective mirrors (Lohnstar Optics, reflectivity 99.98%, radius of curvature 100 cm), separated by a distance of 54.5 cm. The first cavity mirror holder was connected to a to a piezoelectric ring actuator (RA12-24, Piezosystem Jena) and a function generator (AFG 3000 C, Tektronix), so that the cavity length is continuously modulated by 4 μm.
A quantum cascade laser (QCL) with a tuning range of 1224 - 1234 cm−1 (HHL-223, Alpes Lasers) was used. The laser control unit comprised a low-noise QCL driver (QCL1000, Wavelength Electronics) and temperature controller (PTC5K-CH,Wavelength Electronics).

Plasma Diagnostics Procedure

The absorption feature of the optical transitions in the ν6 band of H2O2 was probed within the spectral range of 1231.57 - 1232.00 cm−1, in order to determine the line-of-sight integrated H2O2 density and the pressure broadening coefficient from a model fit. Under the assumption that the effluent, and therefore the distribution of H2O2, is rotationally symmetric, an Abel inversion yields the spatially resolved density distribution of H2O2 in the effluent of both plasma sources.

Public Access Level
Contact Name
Krös, Levin
Contact Email

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