The A3Π(1) → X1Σ(0+) emission spectrum of iodine monofluoride: Analyses of the vibrational and rotational structure

Abstract

Iodine monofluoride A3Π(1) → X1Σ(0+) emission has been observed in the reaction of I2 with F2 at temperatures ranging from 300 to 800 K. Two previously unreported v′ progressions are identified, and vibrational molecular constants are reported for the IF3Π(1) state using bandheads in progressions based on 0 ≤ v′ ≤ 15 and 0 ≤ v″ ≤ 5. The rotational structure has also been recorded and analyzed for nine vibrational bands. The triplet P-, Q-, and R-branch features are resolved for the first time which unambiguously confirms the Ω = 1 assignment of the emitting electronic state. Rotational molecular constants have been determined, and RKR potential energy functions are used to calculate Franck-Condon factors for the IF(A → X) system.