IRC +10216 as a spectroscopic laboratory: improved rotational constants for SiC2, its isotopologues, and Si2C
J. Cernicharo, M. Guélin, M. Agúndez, J. R. Pardo, S. Massalkhi, J. P. Fonfría, L. Velilla Prieto, G. Quintana-Lacaci, N. Marcelino, C. Marka, S. Navarro and C. Kramer
