A laser induced fluorescence study relating to physical properties of the iodine monoxide radical

Abstract

The dispersed fluorescence spectra originating from the v′ = 2 and v′ = 0 levels of the A²Π_3/2 state of iodine monoxide (IO) have been recorded for the first time after laser induced fluorescence (LIF) excitation in the A²Π_3/2 ← X²Π_3/2 electronic transition. The results are used to obtain relative Franck–Condon factors for various v′ → v′′ transitions in the A²Π_3/2 → X²Π_3/2 system up to v′′ = 12 and compared with theoretical predictions. A fluorescence quenching study of the A²Π_3/2 state of IO has also been performed, revealing that collisional quenching and rotational energy transfer (RET) are rapid in the A²Π_3/2 state of IO. The J′-dependence to fluorescence quenching of the A²Π_3/2 (v′ = 2) state of IO by N₂ suggests a collisional predissociation mechanism.