Leibniz Institute for Plasma Science and Technology
Felix-Hausdorff-Str. 2
17489 Greifswald
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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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Spatial distribution of HO₂ in an atmospheric pressure plasma jet investigated by cavity ring-down spectroscopy - dataset

The data set comprises full cavity ring-down spectra and absorption coefficients obtained from on-off-resonance measurements, in order to determine the spatial distribution of HO₂ in the cold atmospheric pressure plasma jet kINPen-sci. Therefore, the plasma jet was operated with 3 slm Ar and 3000 ppm water, and was equipped with a gas curtain of 5 slm O₂. To determine the effective absorption length, the HO₂ absorption was measured in radial direction. These radial fits had a Gaussian-like shape. By performing Abel inversion on the Gaussian fits, spatial distributions of HO₂ in x and y and in x and z direction were obtained.

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

Frequency: ~1 MHz; Power: 1-3 W

Plasma Medium Name
Plasma Medium Properties

Feed gas: 3 slm Ar with 3000 ppm humidity; Gas curtain: 5 slm O2

Plasma Medium Procedure

10% of the Ar flow was guided through a water bubbler held at room temperature. In order to control the effluent’s surrounding gas environment, the kINPen-sci was equipped with a gas curtain device.

Plasma Diagnostics Name
Plasma Diagnostics Properties

Spatially resolved continuous wave cavity ring-down spectroscopy (cw-CRDS) at a laser wavelength λ = 6638.2 cm-1 (1506 nm)

Plasma Diagnostics Procedure

The distributed feedback diode laser was directed via an adjustable fibre collimation package (CFC-8X-C, Thorlabs) and two protected silver coated mirrors into the optical cavity, consisting of two high reflectivity mirrors (Layertec, reflectivity R = 99.998%, radius of curvaturer = 1 m). These mirrors were separated by a distance of L = 80 cm, yielding a minimum beam diameter of 1 mm in the centre of the cavity. The output mirror was mounted on a hollow cylindrical piezoelectric transducer so that the length of the cavity could be modulated by a few laser wavelengths. The exiting light was then focused with an off-axis parabolic mirror onto an InGaAs photodiode (DET10C, Thorlabs), whose photocurrent was amplified by a transimpedance amplifier (DLPCA-200, FEMTO) and sent to a home-built trigger circuit.

The spatial resolution in radial direction was obtained after performing Abel inversion. To determine the spatial distribution the on/off-resonance method was employed (see the description in the publication).

Public Access Level
Contact Name
Klose, Sarah-Johanna
Contact Email

Data and Resources