A. Mozumder, THE QUASI-BALLISTIC MODEL OF ELECTRON-MOBILITY IN LIQUID HYDROCARBONS- APPLICATION TO ELECTRON SCAVENGING, Journal of physical chemistry, 99(17), 1995, pp. 6557-6562
In the two-state, quasi-ballistic model electron scavenging occurs in
the quasi free state with a specific rate k(s)(f), related to the over
all effective rate k(s)(eff) by k(s)(f) = k(s)(eff)(k(tf) + k(ft))/k(t
f), where k(ft) and k(tf) are respectively the rates of trapping and d
etrapping. k(s)(eff) is compared with experimental values for five com
mon scavengers in seven liquid hydrocarbons, and the reaction probabil
ity of the final chemical step is determined by an analysis based on k
(s)(f). In general, both k(s)(f) and the reaction probability decrease
with mobility for all scavengers, partly due to long mean free path o
f the electron in the quasi-free state and partly due to the inefficie
ncy of reaction. Reaction radius is estimated to be similar to 1 nm fo
r most scavengers. Few reactions are found to be diffusion-controlled.
Possible exceptions are low-mobility liquids (e.g., n-hexane) in whic
h almost all scavenging reactions, except for biphenyl, appear to be d
iffusion-controlled.