The Rotational Spectra of the Silicon Isotopic Species of SiCC

Details The Rotational Spectra of the Silicon Isotopic Species of SiCC The Rotational Spectra of the Silicon Isotopic Species of SiCC

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mss..conferg08k&link_type=abstract

"International Symposium On Molecular Spectroscopy, 64th Meeting, Held 22-26 June, 2009 at Ohio State University. http://molspec

Astronomy and Astrophysics

Astrophysics

Astronomical Species And Processes

Scientific paper

Until this work, the rotational spectra of the silicon isotopic species of SiCC were based almost entirely on astronomical frequencies, because only the fundamental 1_{0,1} - 0_{0,0} transition ^{29}SiC_2 and ^{30}SiC_2 had been measured in the laboratory. We have now derived precise rotational and centrifugal distortion constants from laboratory measurements of 35 transitions of each isotopic species between 140 and 360 GHz with J ≤ 10 and K_a ≤ 8. The rotational spectra calculated with the laboratory measured constants are about two orders of magnitude more accurate than that of He et al., who determined the spectroscopic constants from about 20 lines of ^{29}SiC_2 and of ^{30}SiC_2 in the wide-line source IRC+10216. The new laboratory measurements should aid assignment of the silicon isotopic species of SiCC in the spectral line survey of IRC+10216 with the SMA, and in future observations with ALMA.
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