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We present the results of a molecular line survey of the extreme carbon starCRL 3068. The observations were carried out with the Arizona Radio Observatory(ARO) 12m telescope and the Heinrich Hertz Submillimeter Telescope (SMT) at the2mm and 1.3mm atmospheric windows. The observations cover the frequency bandsfrom 130--162 GHz and 219.5--267.5 GHz. The typical sensitivities achieved areT_R<15 mK and T_R<7 mK for the ARO 12m and SMT, respectively. Seventy twoindividual emission features belonging to 23 molecular species andisotopologues were detected. Only three faint lines remain unidentified. Thespecies c-C3H, CH3CN, SiC2, and the isotopologues, C17O and C18O, HC15N, HN13C,C33S, C34S, 13CS, 29SiS, and 30SiS are detected in this object for the firsttime. Rotational diagram analysis is carried out to determine the columndensities and excitation temperatures. The isotopic ratios of the elements C,N, O, S, and Si have also been estimated. The results are consistent withstellar CNO processing and suggest that CRL 3068 is more carbon rich thanIRC+10216 and CIT 6. It is also shown that the chemical composition in CRL 3068is somewhat different from that in IRC+10216 with a more extensive synthesis ofcyclic and long-chain molecules in CRL 3068. The results will provide valuableclues for better understanding circumstellar chemistry.

A molecular line survey of the extreme carbon star CRL 3068 at millimeter wavelengths