The photo-reaction between iodine and hydrogen peroxide in aqueous solution

Photochemically Induced Autocatalysis in the Chlorate Ion−Iodine System

“…The fact that the reaction is driven by the halogen lamp alone proves a significant point: I 2 is the photoactive species because no other component in the system absorbs light in the spectral region emitted by the halogen lamp. This conclusion is by no means surprising as many photochemical reactions of I 2 are known − including its non-autocatalytic oxidation by ClO 2 …”

“…The fact that the reaction is driven by the halogen lamp alone proves a significant point: I 2 is the photoactive species because no other component in the system absorbs light in the spectral region emitted by the halogen lamp. This conclusion is by no means surprising as many photochemical reactions of I 2 are known [15][16][17] including its non-autocatalytic oxidation by ClO 2 . 17 The autocatalytic nature of the ClO 3 --I 2 reaction was demonstrated by the mid-course addition of a small amount of HOCl (Figure 1, curve b) in a kinetic experiment using the conventional double beam instrument.…”