Resonance-enhanced multiphoton ionization spectroscopy of SF2 radical

The electronic spectra of SF2 radical were experimentally investigated by using Resonance-Enhanced Multiphoton Ionization in the excitation wavelength range of 245-365 nm. A pulsed dc discharge technique was applied to generate the neutral SF2 in the supersonic beam of Ar seeded with SF6. From the recorded laser excitation resonance spectra at the mass-electron ratio corresponding to SF2+, ten electronic band system of SF2 including three series of Rydberg states and two valence states were observed, and most of them were vibrationally assigned. A fit of Rydberg formula to the ns origins suggest the adiabatic ionization potential for neutral SF2 being 10.02 eV.