中央研究院 原子與分子科學研究所

We applied the two-color resonant two-photon mass-analyzed threshold ionization (MATI) technique to record the cation spectra of trans-2-fluorostyrene by ionizing via six intermediate vibronic levels. The adiabatic ionization energy was determined to be 69304 ± 5 cm^-
1. The distinct MATI bands at 67, 124, 242, 355, 737, 806, 833, and 993 cm
^-1 were assigned to the active cation vibrations related to out-of-plane substituent-sensitive bending vibrations and in-plane ring deformation and bending motions. Many combination vibrations were also observed. Our experimental results suggest that the molecular geometry and vibrational coordinates of the trans-2-fluorostyrene cation in the D₀ state resemble those of the neutral species in the S₁ state.  

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