Microwave spectroscopic detection of flame-sampled combustion intermediates
| Autor: | Nils Hansen, Daniel A. Obenchain, Katharina Kohse-Höinghaus, Julia Wullenkord, Jens-Uwe Grabow, Isabelle Graf |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie
Rotational spectroscopy Molecular beam mass spectrometries Spectroscopic detection General Chemical Engineering Analytical chemistry Rotational temperature Rotational transition Combustion 02 engineering and technology 010402 general chemistry Mass spectrometry Mole fraction 01 natural sciences Detection and identifications Chemistry General Chemistry Molecules 021001 nanoscience & nanotechnology 0104 chemical sciences Adiabatic flame temperature High-temperature reaction Molecular beams ddc:540 Microwave spectroscopy Gases 0210 nano-technology Combustion intermediates Microwave |
| Zdroj: | RSC Advances 7 (2017), Nr. 60 |
| Popis: | Microwave spectroscopy probes the rotational transitions of polar molecules in the gas phase and is a proven technique for the detection and identification of short-lived molecules produced from a variety of molecular sources. In this explorative study, we demonstrate that two prerequisites can be met for microwave spectroscopy to become a quantitative tool for the analysis of high-temperature gas mixtures as found in combustion environments. First, we show that the rotational temperature of the targeted species can be sufficiently cooled to allow for a sensitive detection of low-lying rotational states after sampling from hot (∼2200 K) flames. Second, we show that signal intensity profiles can be assembled which, after correcting for the different flame temperatures at various sampling positions, agree well with mole fraction profiles obtained via flame-sampling molecular-beam mass spectrometry. Based on the described results, it is conceivable that rotational spectroscopy can contribute towards the unraveling of complex, high-temperature reaction networks. DFG/KO 1363/31-1 Land Niedersachsen |
| Databáze: | OpenAIRE |
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