On improved understanding of plasma-chemical processes in complex low-temperature plasmas

On improved understanding of plasma-chemical processes in complex low-temperature plasmas

Over the last years, chemical sensing using optical emission spectroscopy (OES) in the visible spectral range has been combined with methods of mid infrared laser absorption spectroscopy (MIR-LAS) in the molecular fingerprint region from 3 to 20 μ m, which contains strong rotational–vibrational abso...

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Bibliographic Details
Published in:The European physical journal. D, Atomic, molecular, and optical physics Vol. 72; no. 5; pp. 1 - 11
Main Authors: Röpcke, Jürgen, Loffhagen, Detlef, von Wahl, Eric, Nave, Andy S. C., Hamann, Stephan, van Helden, Jean-Piere H., Lang, Norbert, Kersten, Holger
Format: Journal Article
Language:English
Published: Berlin/Heidelberg Springer Berlin Heidelberg 22-05-2018
Springer Nature B.V
EDP Sciences
Subjects:
Absorption spectra
Applications of Nonlinear Dynamics and Chaos Theory
Atomic
Chemical reactions
Diagnostic software
Diagnostic systems
Infrared lasers
Low temperature
Molecular
Molecular chains
Molecular gases
Optical and Plasma Physics
Optical emission spectroscopy
Physical Chemistry
Physics
Physics and Astronomy
Plasma
Plasma Physics
Plasmas (physics)
Quantum Information Technology
Quantum Physics
Regular Article
Spectroscopy/Spectrometry
Spectrum analysis
Spintronics
Temperature
Temporal resolution
Topical Issue: Fundamentals of Complex Plasmas
Online Access:Get full text
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Summary:Over the last years, chemical sensing using optical emission spectroscopy (OES) in the visible spectral range has been combined with methods of mid infrared laser absorption spectroscopy (MIR-LAS) in the molecular fingerprint region from 3 to 20 μ m, which contains strong rotational–vibrational absorption bands of a large variety of gaseous species. This optical approach established powerful in situ diagnostic tools to study plasma-chemical processes of complex low-temperature plasmas. The methods of MIR-LAS enable to detect stable and transient molecular species in ground and excited states and to measure the concentrations and temperatures of reactive species in plasmas. Since kinetic processes are inherent to discharges ignited in molecular gases, high time resolution on sub-second timescales is frequently desired for fundamental studies as well as for process monitoring in applied research and industry. In addition to high sensitivity and good temporal resolution, the capacity for broad spectral coverage enabling multicomponent detection is further expanding the use of OES and MIR-LAS techniques. Based on selected examples, this paper reports on recent achievements in the understanding of complex low-temperature plasmas. Recently, a link with chemical modeling of the plasma has been provided, which is the ultimate objective for a better understanding of the chemical and reaction kinetic processes occurring in the plasma. Graphical abstract
ISSN:1434-6060
1434-6079
DOI:10.1140/epjd/e2017-80363-7