dc.creator Reilly, Neil J. en_US dc.creator Kokkin, Damian L. en_US dc.creator McCarthy, Michael C. en_US dc.creator Thaddeus, Patrick en_US dc.date.accessioned 2010-07-12T14:14:37Z dc.date.available 2010-07-12T14:14:37Z dc.date.issued 2010 en_US dc.identifier 2010-TG-10 en_US dc.identifier.uri http://hdl.handle.net/1811/46270 dc.description Author Institution: Harvard-Smithsonian Center for Astrophysics, 60 Garden St.; Cambridge, MA 02138, and School of Engineering \& Applied Sciences, Harvard University, 29 Oxford; St., Cambridge, MA 02138 en_US dc.description.abstract We report the first measurement of an electronic spectrum of Si$_2$C, observed in a jet-cooled discharge through silane, acetylene and argon, in the $380-410$\,nm wavelength range. While Si$_2$C is a highly plausible astronomical molecule, searches for its rotational transitions in the laboratory and in space are impractical at present - \emph{ab initio} predictions of the rotational constants of this slightly bent species have yet to performed to within the required accuracy. By analogy with SiC$_2$, the carrier of the well-known Merrill-Sanford bands, electronic spectroscopy may provide estimates of its rotational constants and structure, thereby constraining searches for its millimeter-wave transitions. Our experiments suggest that the electronic transition has a large oscillator strength and a significant fluorescence quantum yield, making it a good candidate for optical detection in space, particularly in those carbon stars where SiC$_2$ is known to be abundant. As part of a more general effort to measure the electronic spectra of small silicon-carbon clusters, several examples of which have been identified in space by radio-astronomy, we present a spectrum of Si$_3$C with a much higher S/N ratio than has been previously reported, and which is now in excellent agreement with theory. en_US dc.language.iso en en_US dc.publisher Ohio State University en_US dc.title OPTICAL SPECTROSCOPY OF SILICON-CARBON CLUSTERS: Si$_2$C and Si$_3$C en_US dc.type Article en_US dc.type Image en_US dc.type Presentation en_US
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