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MO: Fachverband Molekülphysik
MO 20: Poster – Molecular Spectroscopy and Dynamics
MO 20.1: Poster
Wednesday, March 12, 2025, 17:00–19:00, Tent
Auger electron spectroscopy of isothiocyanic acid, HNCS — •Dorothee Schaffner1, Marius Gerlach1, Emil Karaev1, John Bozek2, Ingo Fischer1, and Reinhold Fink3 — 1University of Würzburg, Germany — 2Synchrotron SOLEIL, Saint-Aubin, France — 3University of Tübingen, Germany
Isothiocyanic acid, HNCS, is the simplest isothiocyanate and a molecule of astrochemical interest. In 1979 it was first detected in the interstellar medium towards the molecular cloud Sgr B2(OH).[1] The detection of HNCS in space is intriguing due to its composition of biogenic elements. Its oxygen analogue isocyanic acid, HNCO, is a well-known astrochemical molecule for which a prebiotic role was suggested.[2] Investigating the interaction of HNCS with X-ray radiation is critical to understanding its fate in space.
Here we present the gas phase Auger electron spectra of the reactive molecule isothiocyanic acid that were recorded at the PLEIADES beamline at the synchrotron SOLEIL. X-ray photoelectron and NEXAFS spectra were obtained and the normal and resonant Auger-Meitner processes were studied at the N1s, C1s and S2p edge. We compare our spectra to the previously recorded spectra of isocyanic acid as well as to theoretical simulations in order to give further insights into the observed transitions and the influence of heavy atom substitution on Auger electron spectra.
[1] M. A. Frerking et al., Astrophys. J. 1979, 234, L143-L145.
[2] E. Mendoza et al., Mon. Not. R. Astron. Soc. 2014, 445, 151-161.
Keywords: Auger electron spectroscopy; X-ray absorption spectroscopy; X-ray; astrochemistry