Electronic spectrum measurements are reported for mass selected C$_{6}$$^{+}$ in the gas phase using photodissociation spectroscopy. Carbon cluster cations are produced by laser vaporization and mass selected using a time-of-flight mass spectrometer. Photodissociation of C$_{6}$$^{+}$ measured a strong absorption at 417.1 nm. Experimental results are accompanied with calculations at the B3LYP/Def2TZVP level that explores predicted isomeric structures, their energetics, and vibrational and electronic spectra. Electronic excitations and vibrational hot bands in the spectrum agree more with frequencies predicted for the linear structure than those of the cyclic structure.
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