2008•Archivio istituzionale della ricerca (Alma Mater Studiorum Università di Bologna)Requires access
DETECTION OF SiOH ($X^2A'$) BY FOURIER TRANSFORM MICROWAVE SPECTROSCOPY
Filippo Tamassia, Michael C. McCarthy, P. Thaddeus
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Abstract
The rotational spectrum of the free radical SiOH in its \nground electronic state has been observed by Fourier transform\nmicrowave spectroscopy. The transition has been detected for the main species \nSiOH and for the rare isotopic\nspecies SiOH, Si\nOH, and SiOD. The same transition has also been observed in the excited vibrational states $ \nand $ for the most abundant species. From this data, precise spectroscopic constants have been derived for this\nplausible astronomical molecule, as has an experimental structure (" ).\nIn addition, the transition of HNSi has been detected at high spectral resolution by the same technique, yielding\na precise value for the nitrogen quadrupole coupling constant.