Six transitions of butadiynylidenesilylidyne with J“ between 11 and 27 were detected in the circumstellar envelope of CW Leo (IRC +10216) with the 45 m radiotelescope of the Nobeyama Radio Observatory between 36 and 86 GHz:
M. Ohishi, N. Kaifu, K. Kawaguchi, A. Murakami, S. Saito, S. Yamamoto, S.-I. Ishikawa, Y. Fujita, Y. Shiratori, and W. M. Irvine,
Detection of a new Circumstellar Carbon Chain Molecule, C₄Si
Astrophys. J. 345, L83–L86 (1989).

Contributor(s): H. S. P. Müller; 08, 2010