Collisional dynamics of the IF B 3Π(0+) state. I. Pulsed excitation studies of v′=3 and 4 at high pressure

Collisional processes in the B 3Π(0+) state of IF were studied using temporally and spectrally resolved laser induced fluorescence. Extremely small electronic quenching rate constants (kq≤1×10−14 cm3 molecule−1 s−1) were measured for He, N2, and SF6. For F2, the measured quenching rate constant was (4±1)×10−12 cm3 molecule−1 s−1. Vibrational energy transfer rate coefficients were measured for He and N2. The v′=4 → v′=3 rate constants for He and N2 were (6.9±0.7) ×10−12 and (3.5±0.3)×10−12 cm3 molecule−1 s−1, respectively. For v′=3 → v′=2, the respective rate constants for He and N2 were (5.4±0.5)×10−12 and (2.5±0.2)×10−12 cm3 molecule−1 s−1.