Two photon sesquential absorption spectroscopy of the E(O+) state of iodine monofluoride

The energy levels of a new state of iodine monofluoride lying 5eV above the ground state have been measured using the Two Photon Sequential Absorption (TPSA) technique. The energies of eleven vibrational levels of the state were measured. The state has O+ character, and dissociates to I++F− in the diabatic approximation.