Accession Number : AD0756611

Title :   A Transient Intermediate in the Bimolecular Reaction of Hydrated Electrons,

Corporate Author : BRITISH COLUMBIA UNIV VANCOUVER DEPT OF CHEMISTRY

Personal Author(s) : Basco,N. ; Kenney-Wallace,G. A. ; Vidyarthi,S. K. ; Walker,D. C.

Report Date : 24 DEC 1971

Pagination or Media Count : 13

Abstract : Further studies are reported which attempt to identify the transient species (X) produced from hydrated electrons which may be photodissociated to reform e(aq)(-). The method used involves the production of e(aq)(-) by u.v. flash photolysis of aqueous OH(-)/H2 solutions followed, after any specified delay, by a second and third photo-flash of restricted wavelengths. Photoregeneration of e(aq)(-) is effected by light in the spectral range 320 to 400 nm. Two conditions seem to be necessary in order to detect the presence of X, (i) e(aq)(-) must decay to a considerable extent through the biomolecular dimerisation reaction and (ii) the lifetime of e(aq)(-) with respect to all other reactions must be >ca. 200 microsec. Thus it is not expected to be observable in most pulse radiolysis studies. Its extinction coefficient in that part of its absorption band which leads to photodissociation (320-400 nm) is estimated. Its identity is discussed and it is concluded that X is probably the hydrated electron dimer or a product formed therefrom by association with a cation. (Author)

Descriptors :   (*SOLUTIONS(MIXTURES), *ELECTRONS), (*PHOTOCHEMICAL REACTIONS, WATER), HYDROGEN, HYDROXIDES, HYDRATES, CANADA

Subject Categories : Radiation and Nuclear Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE