Two-dimensional REMPI of CF3Br: Rydberg states and photofragmentation channels

Mass spectra were recorded for (2 + n) REMPI of CF3Br as a function of resonance excitation energy in the 71 320–84 600 cm−1 region to obtain two-dimensional REMPI data. CF 3 + , iBr+ (i = 79,81) and C+ ions were detected. Laser power dependence experiments were performed for ion signals. CF 3 + signals due to resonance transitions from the ground state CF3Br to number of Rydberg states and various vibrational states followed by CF 3 + and Br− ion-pair formation via intersystem crossings, were identified. Bromine atom production by predissociation channels via two-photon excitation to the Rydberg states is proposed, based on detecting bromine atom (2 + 1) REMPI.