SIMBAD references

The C₈H radical has been detected in an argon-acetylene discharge, conclusively confirming the identification by Cernicharo and Guelin in the accompanying Letter of their new linear molecule in IRC+10216. In addition to the ground ²{PI}_3/2 rotational ladder, the ²{PI}_1/2 ladder 19cm^–1 above ground has been detected, and the entire fine structure-rotational spectrum calculated. The standard ²{PI} Hamiltonian fits the laboratory measurements of more than 30 radio lines between 80 and 100GHz to high accuracy; yields precise values for the rotational, fine structure, and lambda-doubling constants; and allows the astronomically most interesting lines in the radio spectrum to be predicted to an uncertainty of 0.1km/s or better.