The yield of the primary products of the liquid water photolysis at 1236 Å and 1470 Å is reported. It was found that besides the dissociation of the excited water molecules into H and OH radicals probably e− aq is also formed. The H and OH radicals were scavenged by means of formate, and the e− aq together with a part of H2O* by adding carbon dioxide. The quantum yields determined at 1236 Å are: Φ(H, OH) = 1.03 ± 0.02, 0.06 < Φ(e− aq, H2O*) < 0.12 and at 1470 Å: Φ(H, OH) = 0.72 ± 0.02, 0.037 < Φ(e− aq, H2O*) < 0.075. The quantum yield of high purity liquid water at 1849 Å in absence of any scavengers is Φ(H, OH) = 0.022. Previously published data by us for 1849 Å are also given: Φ(H, OH) = 0.33 ± 0.01, 0.02 < Φ(e− aq, H2O*) < 0.04. Reaction mechanisms are proposed.
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