# LABORATORY AND ASTRONOMICAL DETECTION OF RHOMBOIDAL $SiC_{3}$

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/19525

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 Title: LABORATORY AND ASTRONOMICAL DETECTION OF RHOMBOIDAL $SiC_{3}$ Creators: Apponi, A. J.; McCarthy, M. C.; Gottlieb, C. A.; Thaddeus, P. Issue Date: 1999 Publisher: Ohio State University Abstract: The rotational spectrum of rhomboidal $SiC_{3}$ in its $^{1}A_{1}$ electronic ground state was measured in a laboratory discharge of silane and acetylene by Fourier transform microwave spectroscopy and direct absorption millimeter wave spectroscopy. A full structure derived from observations of isotopically substituted species shows that $SiC_{3}$ has a planar geometry with $C_{2v}$ symmetry that consists of atoms in the shape of a distorted four-member ring and a transannular carbon-carbon bond. Following the laboratory detection, seven rotational transitions of $SiC_{3}$ near 100 GHz were detected in the circumstellar envelope of the evolved carbon star IRC+10216 using the NRAO 12 meter telescope. Description: Author Institution: Harvard-Smithsonian Center for Astrophysics URI: http://hdl.handle.net/1811/19525 Other Identifiers: 1999-TJ-02