“…Here the majority of electrons are known to be localized (Schiller, 1972;Davis and Brown, 1975;Holroyd, 1987;Nyikos and Schiller, 1988;Schmidt, 1997). Electron mobility is about m ffi 10 À5 m 2 =Vs hence with s % 4 Â 10 À10 m (this being the radius of a bubble around the localized electron) one finds t D % 10 À13 s. The second order scavenging rate coefficient, k 0 s is in the order of k 0 s % 10 12 M À1 s À1 for scavengers like N 2 O, pyrene, SF 6 or CCl 4 (Baxendale et al, 1973;Allen and Holroyd, 1974;Allen et al, 1975, see also Schiller and Nyikos, 1977).…”