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The $1 ^3\Sigma_u^- \leftarrow X^3\Sigma_g^-$ transition of linear HC$_5$H(A) has been observed in a neon matrix and gas phase. The assignment is basedon mass-selective experiments, extrapolation of previous results of the longerHC$_{2n+1}$H homologues, and density functional and multi-state CASPT2theoretical methods. Another band system starting at 303 nm in neon is assignedas the $1 ^1 A_1 \leftarrow X ^1 A_1$ transition of the cumulene carbenepentatetraenylidene H$_2$C$_5$ (B).

Electronic spectra of linear HC$_5$H and cumulene carbene H$_2$C$_5$