Abstract
The time dependence of
G
(e
+
aq
) in the early stages of the radiolysis of water has been investigated using nanosecond pulse techniques by studying the effects of added solutes which remove H
3
O
+
aq
and OH. In pure water
G
(e
aq
) = 3.6 at 7.5 ns and 2.8 at 120 ns after a 5 ns electron pulse. Successive addition of 1 mol OH
-
/l and 1 mol CH
3
OH/l increased
G
(e
aq
) at the earlier time to 4.45 and 5.05 respectively. 1 mol I
-
/l had virtually no effect, and 1 mol Cl
-
/1 only a slight effect, on
G
(e
aq
) in neutral water, and 1 mol HCO
2
/I had no effect at pH 14. From these results it is concluded that (i)
G
0
e
aq
is not less than 5, (ii) G
0
H
is close to zero, and (iii) in the expanding spurs e
aq
+ e
aq
occurs between 10
-8
and 10
-7
s with A
G
(e
aq
) = 0.6, e
aq
+ OH takes place between 10
-9
and 10
-8
s with A
G
(e
aq
) = 0.5, and e
aq
+ H
3
O
+
aq
is predominant between 10
-11
and 10
-9
s, is 80 % complete in 10
-8
s and complete in 10
-7
s with A
G
(e
aq
) = 1.1. Thus the data are in good agreement with the diffusion model and indicate that neither dry charge recombination nor direct excitation of water plays a significant role in the radiolysis of water.
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