In situ flame chemistry tracing by imaging photoelectron photoion coincidence spectroscopy

Adaptation of a low-pressure flat flame burner with a flame-sampling interface to the imaging photoelectron photoion coincidence spectrometer (iPEPICO) of the VUV beamline at the Swiss Light Source is presented. The combination of molecular-beam mass spectrometry and iPEPICO provides a new powerful...

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Bibliographic Details
Published in:Review of scientific instruments 2014-02, Vol.85 (2), p.025101-025101
Main Authors: Osswald, P, Hemberger, P, Bierkandt, T, Akyildiz, E, Köhler, M, Bodi, A, Gerber, T, Kasper, T
Format: Article
Language:English
Subjects:
ALTERNATIVE FUELS
COMBUSTION
CONCENTRATION RATIO
FAR ULTRAVIOLET RADIATION
FLAMES
HYDROXYL RADICALS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
Mass spectrometry
MASS SPECTROSCOPY
MATERIALS SCIENCE
MOLECULAR BEAMS
Organic chemistry
PHOTOELECTRON SPECTROSCOPY
PRESSURE RANGE KILO PA
PRESSURE RANGE PA
Quantitative analysis
REACTION KINETICS
Reaction mechanisms
Scientific apparatus & instruments
SWISS LIGHT SOURCE
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Summary:Adaptation of a low-pressure flat flame burner with a flame-sampling interface to the imaging photoelectron photoion coincidence spectrometer (iPEPICO) of the VUV beamline at the Swiss Light Source is presented. The combination of molecular-beam mass spectrometry and iPEPICO provides a new powerful analytical tool for the detailed investigation of reaction networks in flames. First results demonstrate the applicability of the new instrument to comprehensive flame diagnostics and the potentially high impact for reaction mechanism development for conventional and alternative fuels. Isomer specific identification of stable and radical flame species is demonstrated with unrivaled precision. Radical detection and identification is achieved for the initial H-abstraction products of fuel molecules as well as for the reaction controlling H, O, and OH radicals. Furthermore, quantitative evaluation of changing species concentrations during the combustion process and the applicability of respective results for kinetic model validation are demonstrated. Utilization of mass-selected threshold photoelectron spectra is shown to ensure precise signal assignment and highly reliable spatial profiles.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4861175