SAMOP 2021 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 1: Electronic
MO 1.3: Vortrag
Montag, 20. September 2021, 11:30–11:45, H2
Exploration of the Optical Properties of Small Cationic Silicon Carbides: The Optical Spectrum of Si4C2+ — •Robert G. Radloff, Marko Förstel, Kai Pollow, Taarna Studemund, and Otto Dopfer — Institut für Optik und Atomare Physik, Technische Universität Berlin, Berlin, Germany
It is known that a great number of molecules are present in space. Some of these molecules have already been identified, others remain to be discovered. In the environment of carbon stars like IRC+ 10216, where carbon is more abundant than oxygen, not all carbon is bound into CO and thus a variety of carbon bearing molecules exists in the outer layers of these stars. We focus our research on silicon carbide aggregates. Observations show that small silicon carbide molecules like SiC, Si2C, SiC2, SiC3 and SiC4 are present in the circumstellar medium around the IRC+ 10216. Furthermore, its spectrum shows an emission feature around 12 µm that is tentatively attributed to silicon carbide dust grains.
In our study we are aiming to gain insight into the optical and structural properties and the photochemistry of small cationic silicon carbides as well as a better understanding of their role in astrochemistry and their influence on the formation of silicon carbide dust grains. We present the photofragmentation behavior of various cationic silicon carbides and the first optical spectrum of Si4C2+ recorded by means of photodissociation spectroscopy in the range of 208-330 nm [1].
[1] M. Förstel et al., J. Mol. Spectrosc., 2021, 377, 111427