INP

Leibniz Institute for Plasma Science and Technology
Felix-Hausdorff-Str. 2
17489 Greifswald
GERMANY

https://www.inp-greifswald.de/en/
welcomeatinp-greifswald [punkt] de

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

Dual-comb spectroscopy of ammonia formation in non-thermal plasmas

Plasma-activated chemical transformations promise the efficient synthesis of salient chemical products. However, the reaction pathways that lead to desirable products are often unknown, and key quantum-state-resolved information regarding the involved molecular species is lacking. Here we use quantum cascade laser dual-comb spectroscopy (QCL-DCS) to probe plasma-activated NH3 generation with rotational and vibrational state resolution, quantifying state-specific number densities via broadband spectral analysis. The measurements reveal unique translational, rotational and vibrational temperatures for NH3 products, indicative of a highly reactive, non-thermal environment. Ultimately, we postulate on the energy transfer mechanisms that explain trends in temperatures and number densities observed for NH3 generated in low-pressure nitrogen-hydrogen (N2–H2) plasmas. This dataset provides the supplementary data to the published article.

FieldValue
Group
Authors
Release Date
2024-05-22
Identifier
229a7e48-1c72-4ee0-9223-af045205a5bc
Permanent Identifier (DOI)
Permanent Identifier (URI)
Is supplementing
Plasma Source Name
Plasma Source Application
Plasma Source Specification
Plasma Source Properties

The plasma was generated in a plasma nitrocarburizing (PNC) reactor for all the measurements, with DC voltage and a power of 355 ± 50 W.

Plasma Source Procedure
The discharge was located on a metal mesh of stainless steel in the top of the reactor. A workload made of stainless steel was also used to increase the discharge power and the stability of the plasma, and it was negatively biased relative to the reactor wall. The outer wall of the reactor is cooled to near room temperature at 295 K ± 1 K by a recirculating flow of water at 293.0 K ± 0.1 K.
Plasma Medium Name
Plasma Medium Properties

The measurements were conducted at a pressure of 1 mbar with N2 and H2 gases as the precursors. Different mixtures of N2 and H2 gas precursors were delivered to the reactor at a constant mass flow rate of (500 ± 5) standard cubic centimeters per minute (sccm).

Plasma Medium Procedure

The measurements were conducting at room temperature with no external heating.

Plasma Target Name
Plasma Target Properties
A workload made of stainless steel was also used to increase the discharge power and the stability of the plasma, and it was negatively biased relative to the reactor wall.
Plasma Diagnostics Name
Plasma Diagnostics Properties

The dual-comb source (IRsweep IRis-core) emitted in the spectral range from 1035 cm−1 to 1085 cm−1 with repetition rates of frep ≈7.417 GHz, a difference in repetition rates of Δfrep = 2.1 MHz and average output optical powers ≥100 mW.

Plasma Diagnostics Procedure

The QCL outputs were attenuated by approximately tenfold using neutral density filters and aligned to create two dual-comb paths: reference and probe. Polarizers were used in each recombined QCL beam path to match interferogram intensities, and the dual-comb beams were focused onto photodetectors using off-axis parabolic mirrors with focal lengths of 25.4 mm.

Language
English
License
Public Access Level
Public
Contact Name
Ibrahim Sadiek
Contact Email

Data and Resources