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Research group of Ingo Fischer

Spectroscopy with soft X-Ray radiation

Spectroscopy of the auger processes and fragmentation of small unstable molecules

Soft X-ray radiation (about 100 to 100000 eV, 12 to 0.012 nm) is capable of exciting or ionizing the electrons from 1s orbitals of molecules. This produces highly excited molecules (>10000 kJ/mol), which can emit a large part of their energy through the Auger-Meitner effect. Here, a valence electron fills the vacancy in the 1s orbital and transfers the released energy to another valence electron, which gets ionized. These auger electrons can be detected to infer information about the electronic structure of the molecule. We conduct experiments at the Synchrotron SOLEIL to detect these electrons as well as the produced cationic molecules. This project aims to investigate unstable molecules like Isocyanic acid (HNCO), Fulminic acid (HCNO) and Isothiocyanic acid (HNCS). These molecules have astrochemical relevance and may also play a role in the formation of the first prebiotic molecules. Further measurements with soft X-ray radiation are conducted at the Elettra synchrotron.


Recent publications:

1. Marius Gerlach, Dorothee Schaffner, Tobias Preitschopf, Emil Karaev, John Bozek, Fabian Holzmeier, Ingo Fischer
X-ray induced fragmentation of fulminic acid, HCNO
J. Chem. Phys. 159, 114306 (2023)

2. Marius Gerlach, Tobias Preitschopf, Emil Karaev, Heidy M. Quitián-Lara, Dennis Mayer, John Bozek, Ingo Fischer, Reinhold F. Fink
Auger electron spectroscopy of fulminic acid, HCNO: an experimental and theoretical study
Phys. Chem. Chem. Phys., 2022,24, 15217-15229

3. Marius Gerlach, Felipe Fantuzzi, Lilith Wohlfart, Karina Kopp, Bernd Engels, John Bozek, Christophe Nicolas, Dennis Mayer, Markus Gühr, Fabian Holzmeier, Ingo Fischer           
Fragmentation of isocyanic acid, HNCO, following core excitation and ionization
J. Chem. Phys. 154, 114302 (2021)