In situ flame chemistry tracing by imaging photoelectron photoion coincidence spectroscopy

Journal Article · Sat Feb 15 00:00:00 EST 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4861175· OSTI ID:22253552

Oßwald, P.; Köhler, M. ^[1]; Hemberger, P.; Bodi, A.; Gerber, T. ^[2]; Bierkandt, T.; Akyildiz, E.

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1. German Aerospace Center (DLR) – Institute of Combustion Technology, Stuttgart 70569 (Germany)
2. Molecular Dynamics Group, Paul Scherrer Institut, CH-5232 Villigen (Switzerland)

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.

• OSTI ID: 22253552
• Journal Information: Review of Scientific Instruments, Vol. 85, Issue 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
ALTERNATIVE FUELS
COMBUSTION
CONCENTRATION RATIO
FAR ULTRAVIOLET RADIATION
FLAMES
HYDROXYL RADICALS
MASS SPECTROSCOPY
MOLECULAR BEAMS
PHOTOELECTRON SPECTROSCOPY
PRESSURE RANGE KILO PA
PRESSURE RANGE PA
REACTION KINETICS
SWISS LIGHT SOURCE