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MO: Fachverband Molekülphysik
MO 15: MO Poster 3
MO 15.15: Poster
Mittwoch, 11. März 2020, 17:00–19:00, Empore Lichthof
Emission spectroscopy using heterodyne receivers — •Nadine Wehres, Bettina Heyne, Marius Hermanns, Jakob Maßen, Kirill Borisov, Katharina von Schoeler, Patrick Pütz, Cornelia Noningh, Urs Graf, Frank Lewen, and Stephan Schlemmer — I. Physics Institute, University of Cologne, Cologne, Germany
Two laboratory emission spectrometers between 70-110 GHz (coincident with ALMA Band 3) and 300-400 GHz (coincident with ALMA Band 7) have been described before [1,2] and will be discussed here with special focus on its stability and sensitivity, as well as its prospects on absolute intensity calibration [3]. Following-up on these recent advances towards heterodyne detection, we present preliminary results using the SOFIA (Stratospheric Observatory for IR Astronomy) upGREAT laboratory setup, operational around 2 THz, for the spectroscopy of complex molecules. First spectra focus on pure rotational transitions of vinyl cyanide (C2H3CN). These spectra are used to estimate intensities of ro-vibrational transitions coming from low-lying vibrational bands of polycyclic aromatic hydrocarbons (PAHs). The results are used as feasibility study to exploit future research directions for the spectroscopy of the fingerprint-like ro-vibrational transitions of PAHs at around 2 THz.
References:
[1] N. Wehres, et al. IAUS 332 (2018)
[2] N. Wehres, et al. PCCP 20, 5530 (2018)
[3] N. Wehres, et al. IAUS 350 (2019, accepted)