Photodissociation spectrum of naphthalene dimer cation

The electronic spectrum of (C₁₀H₈)₂⁺ is obtained in the 455-1400 nm region by applying photodissociation spectroscopy to the ion produced by the laser-induced plasma technique. The spectrum shows a local excitation band at 580 nm and a charge resonance band at 1180 nm. The locations of these bands coincide with those reported for intramolecular dimer cations of dinaphthylpropanes with a partially overlapped conformation, suggesting that (C₁₀H₈)₂⁺ has a similar conformation in the gas phase.