SAMOP 2023 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 34: Ultrafast Dynamics III (joint session MO/A)
A 34.2: Vortrag
Freitag, 10. März 2023, 14:45–15:00, F102
Fragmentation of fulminic acid, HCNO, following core excitation and ionization — •Dorothee Schaffner1, Marius Gerlach1, Tobias Preitschopf1, Emil Karaev1, Fabian Holzmeier2, John Bozek3, and Ingo Fischer1 — 1Universität Würzburg, 97074 Würzburg — 2imec, 3001 Leuven, Belgium — 3Synchrotron SOLEIL, 91190 Saint-Aubin, France
In 2008 fulminic acid, HCNO, was first detected in space in the starless cores B1, L1544 and L183.[1] Its isomer HNCO is also ubiquitous in interstellar systems.[2] Due to their composition of biogenic elements, the CHNO isomers have been proposed to play a prebiotic role as intermediates for organic life. Investigating the molecules’ interaction with X-ray radiation is critical to understand their fate in space.
Here we report a study of the fragmentation of fulminic acid in the gas phase after resonant core excitation and core ionization on the K-edge of carbon, oxygen and nitrogen. The ionic fragmentation products formed after the auger decay were investigated at the PLEIADES beamline at the synchrotron SOLEIL using Auger-electron/photoion coincidence spectroscopy. Branching ratios were determined which show a site-selective fragmentation upon ionization and excitation. Different fragmentation tendencies could be related to differences in the occupation of the auger final states.
[1] N. Marcelino, J. Cernicharo, B. Tercero, E. Roueff, Astrophys. J. 2008, 690, L27-L30.
[2] Nguyen-Q-Rieu, C. Henkel, J. M. Jackson, R. Mauersberger, Astron. Astrophys. 1991, 241, L33-L36.