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dc.creatorReilly, Neil J.en_US
dc.creatorKokkin, Damian L.en_US
dc.creatorMcCarthy, Michael C.en_US
dc.creatorThaddeus, Patricken_US
dc.date.accessioned2010-07-12T14:14:37Z
dc.date.available2010-07-12T14:14:37Z
dc.date.issued2010en_US
dc.identifier2010-TG-10en_US
dc.identifier.urihttp://hdl.handle.net/1811/46270
dc.descriptionAuthor 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 02138en_US
dc.description.abstractWe 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.isoenen_US
dc.publisherOhio State Universityen_US
dc.titleOPTICAL SPECTROSCOPY OF SILICON-CARBON CLUSTERS: Si$_2$C and Si$_3$Cen_US
dc.typeArticleen_US
dc.typeImageen_US
dc.typePresentationen_US


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