“…The smooth variation of the transfer coefficient over a wide range of potentials, observed recently [496] in reactions of anodic oxidation of photochemically generated hydrogen, is even more interesting (see section 6.8 for a detailed account of photoelectrochemical reactions involving hydrogen). There are some theoretical reasons to assume that the constant value of a over a wide range of potentials is characteristic only of reactions accompanied by the formation of chemisorbed intermediate products [497]. This question, however, requires further investigation.…”