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A molecular line survey has been carried out toward the carbon-richasymptotic giant branch star CW Leo employing the HIFI instrument on board ofthe Herschel satellite. Numerous features from 480 GHz to beyond 1100 GHz couldbe assigned unambiguously to the fairly floppy SiC$_2$ molecule. However,predictions from laboratory data exhibited large deviations from the observedfrequencies even after some lower frequency data from this survey wereincorporated into a fit. Therefore, we present a combined fit of all availablelaboratory data together with data from radio-astronomical observations.

journal of molecular spectroscopy

Spectroscopic parameters for silacyclopropynylidene, SiC$_2$, from  extensive astronomical observations toward CW Leo (IRC +10216) with the  Herschel satellite