1. SOLEIL and ALMA views on prototypical organic nitriles: C2H5CN
- Author
-
Marie-Aline Martin-Drumel, Oliver Zingsheim, Paola Caselli, Tianwei Zhang (张天惟), Luis Bonah, Álvaro Sánchez-Monge, Peter Schilke, Nadine Wehres, Stephan Schlemmer, Christian P. Endres, T. Möller, Olivier Pirali, Sven Thorwirth, Michael C. McCarthy, Max-Planck-Institut für Extraterrestrische Physik (MPE), Institut des Sciences Moléculaires d'Orsay (ISMO), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Universität zu Köln, Harvard-Smithsonian Center for Astrophysics (CfA), Harvard University [Cambridge]-Smithsonian Institution, and Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
ALMA observations ,Infrared ,Infrared spectroscopy ,Far-IR rotation-vibration ,010402 general chemistry ,01 natural sciences ,Fourier transform spectroscopy ,Synchrotron ,law.invention ,chemistry.chemical_compound ,law ,Ethyl cyanide ,0103 physical sciences ,Physical and Theoretical Chemistry ,Spectroscopy ,Physics ,010304 chemical physics ,Propionitrile ,Atacama Large Millimeter Array ,Atomic and Molecular Physics, and Optics ,0104 chemical sciences ,Rotational energy ,chemistry ,Brightness temperature ,[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] ,Atomic physics ,G327.3−0.6 - Abstract
The high resolution vibrational spectrum of ethyl cyanide (C2H5CN) has been investigated in the far-IR using synchrotron-based Fourier transform spectroscopy. The assignment was performed using the Automated Spectral Assignment Procedure (ASAP) allowing accurate rotational energy levels of the four lowest fundamental vibrations of the species, namely the v 13 = 1 @ 205.934099(8) cm−1, v 21 = 1 @ 212.141101(8) cm−1, v 20 = 1 @ 372.635293(15) cm−1, and v 12 = 1 @ 532.699617(16) cm−1 states, to be determined. The analysis not only confirms the applicability of the ASAP in the treatment of (dense) high-resolution infrared spectra but also reveals some of its limitations. Complementary to the infrared study, the pure rotational spectrum of C2H5CN was also studied in selected frequency ranges from 75 to 255 GHz. New observations of a prototypical high-mass star-forming region, G327.3–0.6, performed with the Atacama Large Millimeter Array show that vibrational satellites of C2H5CN can be very intense, of order several tens of Kelvin in units of brightness temperature.
- Published
- 2021