Heidelberg 2015 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 23: Progress on Various Topics in Molecular Physics
MO 23.5: Vortrag
Freitag, 27. März 2015, 12:00–12:15, PH/SR106
The Bending Vibration of the C3-Molecule and its Isotopologues in the Terahertz Region — •Thomas Büchling, Alexander Breier, Guido Fuchs, and Thomas Giesen — Universität Kassel, Institut für Physik, Heinrich-Plett Str. 40, 34132 Kassel
Short carbon chains are fundamental for the chemistry of stellar and interstellar ambiences: They are omnipresent throughout the interstellar medium, they likely participate in the formation of long carbon chains and they are products in photo-fragmentation processes of larger species.
Triatomic carbon C3 exhibts a mid-infrared ν3 antisymmetric streching mode and a ν2 bending vibration at 1.9 THz. The detection of ν2 is experimentically challenging as radiation sources in the terahertz frequency region were missing for a long time as they are in the transition area between optical and microwave techniques.
In our experiment carbon is vaporized by laser-ablation and diluted in a supersonic jet of helium. Through absorption spectroscopy the molecular constants of the main isotopologue 12C12C12C and of singly 13C substituted species are derived.
These laboratory measurements are taken as a basis for further astrophysical observations of different C3-isotopologues. This will lead to a better understanding of the chemistry of the stellar and interstellar medium.