Laser induced fluorescence study of the B̃ 2B2→X̃ 2A2 transition of the furan cation in a supersonic free jet expansion

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Abstract
The first experimental observation of laser induced fluorescence from the furan cation, C4H4O+, is reported. The ion is formed in a supersonic free jet via a two photon ionization involving the 193 nm output of an ArF excimer laser. The B̃→X̃ electronic transition is probed and vibrational assignments are presented for both states. Comparisons to the infrared, Raman, multiphoton ionization, and photoelectron spectrum of the parent molecule are made. The term value T00 for the B̃→X̃ electronic transition is located at 24 675 cm−1, which differs drastically with previously reported values from both experimental and theoretical investigations. These differences are discussed and probable explanations proposed. The lifetime of the vibrationless level of the B̃ state is measured to be 330 ns.

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