Leibniz Institute for Plasma Science and Technology
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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.

Cite Dataset

Ar metastable densities (³P₂) in the effluent of a filamentary atmospheric pressure plasma jet with humidified feed gas - dataset

The Ar(³P₂) metastable density in the effluent of the cold atmospheric pressure plasma jet kINPen-sci was investigated as a function of the feed gas humidity, the gas curtain composition, and the distance from the nozzle by means of laser atomic absorption spectroscopy. The data set comprises the axial distributions of the Ar metastables as a function of these parameters.

Release Date
Permanent Identifier (DOI)
Permanent Identifier (URI)
Is supplementing
Plasma Source Name
Plasma Source Application
Plasma Source Specification
Plasma Source Properties
Frequency: 860 MHz; Power: 1-3 W
Plasma Medium Name
Plasma Medium Properties
Feed gas: 3 slm Ar with humidity contents up to 1370 ppm; Gas curtain: 5 slm N₂/O₂ mixture
Plasma Medium Procedure
Part of the feed gas was guided through a water bubbler to humidify the feed gas. The humidity was determined by a chilled mirror hygrometer (EdgeTech, DewMaster).
Plasma Diagnostics Name
Plasma Diagnostics Properties

Laser wavelength: 811.534 nm; Laser linewidth: ~15 fm (0.0002 cm⁻¹);
The laser system comprised a laser diode, an external cavity-like setup made of two acousto-optic modulators, a grating in Littrow configuration, as well as a Michelson–Morley interferometer for the coarse determination of the laser wavelength, enabling a tuning range of about 50 GHz at a frequency of 4.5 GHz.

Plasma Diagnostics Procedure

An acousto-optic modulated (AOM) laser system (EasyLAAS, neoplas control GmbH, Germany) was used to probe the optical Ar(1s₅-2p₉) transition. The beam was guided through an optical fiber to a beam splitter cube. 50% of the laser intensity was reflected into a second fiber, which was connected to a wavemeter (High Finesse, WSG-200) in order to determine the exact laser wavelength. The other 50% (approximately 50 μW) were focused by a lens (focal length 75 mm) to a spot of approximately 100 μm in the effluent of the plasma jet. The plasma jet’s position in axial and radial direction was adjusted by three step motors. In order to avoid the detection of plasma emission next to the transmitted laser light, the laser beam was filtered by a 10 nm bandpass filter at 810 nm. With a second lens, the beam was focused onto a photo detector (Femto, current amplifier HCA-S, 200 MHz band width), which was connected to an oscilloscope (Tektronix, DPO 4104) and read out by acustomized python code on a standard computer.

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

Data and Resources