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The negative molecular ion C 6 H Ϫ has been detected in the radio band in the laboratory and has been identified in the molecular envelope of IRC ϩ10216 and in the dense molecular cloud TMC-1. The spectroscopic constants derived from laboratory measurements of 17 rotational lines between 8 and 187 GHz are identical to those derived from the astronomical data, establishing unambiguously that C 6 H Ϫ is the carrier of the series of lines with rotational constant 1377 MHz first observed by K.doi:10.1086/510238 fatcat:2t4lcatenbbr3efesk3odi6iky