Optical Spectroscopy of Silicon-Carbon Clusters: Si_2C and Si_3C

Details Optical Spectroscopy of Silicon-Carbon Clusters: Si_2C and Si_3C Optical Spectroscopy of Silicon-Carbon Clusters: Si_2C and Si_3C

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..confetg10r&link_type=abstract

"International Symposium On Molecular Spectroscopy, 65th Meeting, Held 21-25 June, 2010 at Ohio State University. http://molspec

Astronomy and Astrophysics

Astronomy

Electronic (Uv/Vis/Nir)

Scientific paper

We report the first measurement of an electronic spectrum of Si_2C, observed in a jet-cooled discharge through silane, acetylene and argon, in the 380-410 nm wavelength range. While Si_2C is a highly plausible astronomical molecule, searches for its rotational transitions in the laboratory and in space are impractical at present - 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_3C with a much higher S/N ratio than has been previously reported, and which is now in excellent agreement with theory.

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