The linear SiC9 cluster has been detected for the first time in Fourier-transform infrared spectra observed when the products from the laser evaporation of Si/C rods were trapped in Ar at similar to 10 K. Comparison of C-13 isotopic shift measurements with the results of density functional theory calculations (DFT) confirms the identification of the nu(4)(sigma) mode of SiC9 at 1935.8 cm(-1).