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Electronic absorption spectra of linear HC 2n+1 H + ͑n =2-7͒ were recorded in 6 K neon matrices following their mass-selective deposition. Four new electronic band systems are identified; the strongest Ẽ 2 ⌸ g/u ← X 2 ⌸ u/g lies in the UV and the second most intense C 2 ⌸ g/u ← X 2 ⌸ u/g is located in the visible range. The known à 2 ⌸ g/u ← X 2 ⌸ u/g absorption is an order of magnitude weaker than C 2 ⌸ g/u ← X 2 ⌸ u/g . Transitions to the B and D states are also discussed. The wavelengths ofdoi:10.1063/1.3455208 pmid:20632752 fatcat:kmqucv4pxndznc2qoqibccw3jy