CRC 1316 Transient Atmospheric Plasmas: From Plasmas to Liquids To Solids

A1 A2 A3 A4 A5 A6 A7 A8 A9 B1 B2 B4 B5 B7 B8 B11 B12 B13 B14 B15 INF MGK PR

A3: Excitation transfer between molecules in transient atmospheric pressure plasmas and its impact on plasma chemistry

Principal Investigators: A. von Keudell, D. Reiser

Team


von Keudell, Achim
(Principal Investigator)

Reiser, Dirk
(Principal Investigator)

Vervloedt, Steijn
(PhD)

Yu, Siqi
(PhD)

Seferoglu, Fatma-Nur
(PhD)

Riabosthan, Mariia
(Staff)

Description

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The internal excitation of molecules and the non-equilibrium population of the degrees of freedom of molecules in a plasma is at the core of plasma chemistry. For example, vibrational excitation lowers activation barriers for electron induced dissociation reactions and determines thereby the energy and conversion efficiency of a plasma chemical process. Metastable states store electronic excitation, which can be transferred to molecules to trigger dissociation. This project aims at a fundamental understanding of the transfer of this excitation depending on the plasma (leading to a specific electron energy distribution function) and the plasma mixture defining the collision partners and thereby the various quenching routes and on the different reactive surfaces. This is evaluated by using Fourier transform infrared absorption (FTIR) spectroscopy for molecules with strong dipole moments such as CO2, CH4, CO, and H2O for lower lying excitation states and threshold ionisation (TI) molecular beam mass spectrometry (MBMS) for higher metastable excitation states. This is combined with an in-situ analysis of the catalytic surfaces using infrared reflection absorption techniques (IRRAS) and spectroscopic ellipsometry (SE). A multi diagnostics set-up will be developed to integrate the various plasma excitation schemes of the CRC 1316 and the different catalytic active surfaces.


Publications

Thesis

  • Christoph Stewig, PhD thesis - ongoing
    Excitation transfer between molecules in transient atmospheric pressure plasmas and its impact on plasma chemistry
  • Steffen Schüttler, Bachelor thesis - 09/2018
    Plasma Catalysis of CO2 Reduction
  • Thilo Romba, Bachelor thesis - 09/2018
    Plasma Conversion of CH4 O2 Mixtures
  • Theresa Urbanietz, PhD thesis - ongoing
    Plasma Catalysis during Conversion of Methane/Oxygen/Hydrogen Gas Mixtures
  • Boris Daniil, Bachelor thesis - 01/2021
    Simulation der Nachweisempfindlichkeit eines Atmosphärendruck-Massenspektrometers
  • Steijn Vervloedt, PhD thesis - ongoing
  • Daniel Henze, Bachelor thesis - 09/2022
    Measurement of carbon monoxide production in atmospheric pressure plasmas
  • Siqi Yu, PhD thesis - ongoing
  • Fatma-Nur Seferoglu, PhD thesis - ongoing

Further reading

  • Unexpected O and O3 production in the effluent of He/O2 microplasma jets emanating into ambient air,
    D. Ellerweg, A. von Keudell, and J. Benedikt,
    Plasma Sources Sci. Technol. 21, 034019 (2012)