Modern molecular beam mass spectrometry (MBMS) is an optimal instrument for tracing various chemical species in stationary combustion processes. The mass spectrometry group operates two MBMS systems optimized for the investigation of gas-phase reactions and characterization of combustion characteristics of different (alternative) fuels.
Molecular Beam Mass Spectrometry (MBMS) is an analytical technique for determining the molecular weight of molecules sampled from a reactive environment. Gases are probed in-situ and the sample is expanded into a molecular beam. Thus, chemical reactions are quenched immediately and the sample composition is "frozen". Even highly reactive species, such as radicals, are preserved by this sampling technique and are detectable. The subsequent mass spectrometric analysis allows for the separation of species by their individual molecular weight.
The combination of molecular beam sampling with a time-of-flight mass spectrometer (TOF) provides multiple advantages:
The group operates two mass spectrometers with different focus:
The group was formed in 2012 and deals with chemical questions in the topics fuels, pollutants and gasification. The group operates between the departments of chemical kinetics and combustion laser diagnostics and combines the activities through MBMS experiments. The given tasks range from fundamental kinetical research such as the experimental analysis of chemical reactions networks in reactive environments of combustion, gasification and pyrolysis processes up to exhaust gas measurements on technical test rigs focusing on nano particulate matter.