Conventional absorption spectroscopy is still the workhorse in high-resolution rotational laboratory spectroscopy.1 The data obtained from these kind of instruments are relevant for astronomical searches of complex molecules that represent excellent probes of the physical and chemical environments and history of the sources where they are detected.2 Nowadays, observations performed by the Atacama Large Millimeter Array (ALMA) open up new opportunities to reveal the chemical complexity of solar systems analogues. At the same time the huge amount of data collected and the extremely rich surveys represent a challenge for the astrochemistry community. The chance to detect molecules with an increasing large number of atoms, goes hand in hand with the complexity of their conformational equilibria, often associated with large amplitude motions, that need to be analysed in laboratory before taking on an astronomical search. For this reason a strong interplay between the laboratory spectroscopists and the observational astronomers is increasingly required to be able to unravel the spectra, which are rather difficult to predict theoretically, mainly in the sub-mm wave region. In this talk laboratory results on diols and thiols of potential astronomical interest, obtained using the only Free Jet Absorption Millimeter Wave (FJAMMW) spectrometer working at the University of Bologna,3 will be presented. The rotational spectra (59.6 - 74.4 GHz, corresponding to 5.03 - 4.03 mm) reveal the presence of six conformers for 1,2-butanediol (C4H10O2) and four conformers for 1,3-propanedithiol (C3H8S2), proving the complexity of the conformational landscapes of these kind of compounds. Moreover, taking advantage of the existing public ALMA data, some considerations on the rich molecular line spectrum of the Class 0 protostellar binary IRAS 16293-2422 will be discussed. References [1] S. Brünken, S. Schlemmer, arXiv:1605.07456, 2016 [2] E. Herbst, E. F. van Dishoeck, Annu. Rev. Astron. Astrophys. 47, 427, 2009 [3] C. Calabrese, A. Maris, L. Evangelisti, L. B. Favero, S. Melandri, W. Caminati, J. Phys. Chem. A. 117, 13712, 2013
Calabrese, C., Maris, A., Marcelino, N., Vigorito, A., Melandri, S. (2016). High Resolution Free Jet Millimeter Wave Absorption Spectroscopy: a bridge to Astrochemistry.
High Resolution Free Jet Millimeter Wave Absorption Spectroscopy: a bridge to Astrochemistry
CALABRESE, CAMILLA;MARIS, ASSIMO;VIGORITO, ANNALISA;MELANDRI, SONIA
2016
Abstract
Conventional absorption spectroscopy is still the workhorse in high-resolution rotational laboratory spectroscopy.1 The data obtained from these kind of instruments are relevant for astronomical searches of complex molecules that represent excellent probes of the physical and chemical environments and history of the sources where they are detected.2 Nowadays, observations performed by the Atacama Large Millimeter Array (ALMA) open up new opportunities to reveal the chemical complexity of solar systems analogues. At the same time the huge amount of data collected and the extremely rich surveys represent a challenge for the astrochemistry community. The chance to detect molecules with an increasing large number of atoms, goes hand in hand with the complexity of their conformational equilibria, often associated with large amplitude motions, that need to be analysed in laboratory before taking on an astronomical search. For this reason a strong interplay between the laboratory spectroscopists and the observational astronomers is increasingly required to be able to unravel the spectra, which are rather difficult to predict theoretically, mainly in the sub-mm wave region. In this talk laboratory results on diols and thiols of potential astronomical interest, obtained using the only Free Jet Absorption Millimeter Wave (FJAMMW) spectrometer working at the University of Bologna,3 will be presented. The rotational spectra (59.6 - 74.4 GHz, corresponding to 5.03 - 4.03 mm) reveal the presence of six conformers for 1,2-butanediol (C4H10O2) and four conformers for 1,3-propanedithiol (C3H8S2), proving the complexity of the conformational landscapes of these kind of compounds. Moreover, taking advantage of the existing public ALMA data, some considerations on the rich molecular line spectrum of the Class 0 protostellar binary IRAS 16293-2422 will be discussed. References [1] S. Brünken, S. Schlemmer, arXiv:1605.07456, 2016 [2] E. Herbst, E. F. van Dishoeck, Annu. Rev. Astron. Astrophys. 47, 427, 2009 [3] C. Calabrese, A. Maris, L. Evangelisti, L. B. Favero, S. Melandri, W. Caminati, J. Phys. Chem. A. 117, 13712, 2013I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
