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Universität zu Köln
Mathematisch-Naturwissenschaftliche Fakultät

I. Physikalisches Institut

Sonderforschungsbereich 494

Project Section E3

Synthesis of new molecules for laboratory scale spectroscopy

The work planned in project section E3, which is the synthesis and spectroscopic investigation of new, small, highly reactive molecules with astrochemical relevance in the gas phase, will be in part continuing the previous work on hydrogen and chalcogen (E = O or S) containing species like HSOH. Also we will try to spectroscopically characterize ions like HEn+, H2En+, H3E2+ and especially H5O2+ which have been recently detected in the plasma by MS selection.

Additionally we will open a new field of chemistry with the astrochemical relevant iron containing molecules FeCO, FeO, FeS, FeOH or FeSH. The general working methods will be the same in both the ongoing and the planned work. For the generation of the species, we will pursue two issues: Flash vacuum pyrolysis should allow creating the target molecules from (synthesized) precursor molecules (complexes) by ligand elimination processes. Alternatively radio frequency induced discharge should give novel molecules from mixtures of elements or precursor molecules. For the characterization of the products we will use the existing setups of quadrupole mass spectrometry, IR and rotational spectroscopy (in collaboration with project sections E1, E2, and E4). Quantum chemical calculations will help to understand the obtained spectra and will also enable us to optimize the generation processes for the species by varying the precursor molecules and the synthesis conditions.

Furthermore it is intended to strengthen the spectroscopic characterization of species and the analysis of the reaction mixtures generated by precursor pyrolysis and especially by gas discharge by matrix isolation technique. These mixtures are quite complex and a detailed analysis is the key to the understanding of the reaction mechanism and thus to the improvement and development of our synthetic methods. Matrix isolation would most effectively complement the mass spectrometric analysis of the reaction mixtures, which we presently use.


See the home page of Prof. Klein for more information.