Excitation of iodine by singlet molecular oxygen. Part 2.—Kinetics of the excitation of the iodine atoms

Abstract

Excitation of atomic iodine in the gas phase by singlet molecular oxygen is shown to involve the following reactions: I + O₂(¹Δ)= I*+ O₂(³∑)(1), I*+ O₂(¹Δ)= I + O₂(¹∑)(2), I*= I +hν(3), O₂(¹∑)= O₂(³∑)+hν(4), I*+ O₂(³∑)= I + O₂(¹Δ). (5) Values of k₁=(4.6 ± 1.5)× 10¹³ cm³ mol^–1 s^–1, k₂=(1.6 ± 0.2)× 10¹⁰ cm³ mol^–1 s^–1 and k₅=(1.6 ± 0.5)× 10¹³ cm³ mol^–1 s^–1 at 295 K are derived, as are limiting rate constants for certain quenching processes.