Abstract
An extensive search for the linear CAN radical towards the circumstellar envelope IRC+10216 has been performed. Eight frequency bands of the rotational transitions J = 7/2-5/2 up to 13/2-11/2 and 17/2-15/2 up to 23/2-21/2 of the C 2 N molecule including their λ-doubling components have been probed, using the IRAM 30 m telescope at Pico Veleta, Spain. However, there is no evidence for the existence of the C 2 N radical towards IRC+10216. Instead, a new upper limit N T = 3.8 x 10 -12 cm -2 for the column density of C 2 N was estimated. Additionally, at least ten yet unidentified lines have been found.
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