A new infrared band in the Interstellar and Circumstellar Clouds: C_4 or C_4H?

J. Cernicharo, J. R. Goicoechea, Y. Benilan

We report on the detection with the Infrared Space Observatory (ISO) of a molecular band at 57.5 microns (174 cm^{-1}) in carbon-rich evolved stars and in Sgr B2. Taking into accou…