Geoscience Reference
In-Depth Information
3
2
0
a
1
DISTANCE FROM CENTER
Fig. 3.17
Same as in Fig.
3.13
. Energy is always positive,
E
> 0, but the ion reaches the particle
surface if
E
exceeds the threshold energy. Then the ions with L<L.r
/ reach the particle surface
It is of interest to have the solution corresponding to the ion sticking .E/
depending on the ion energy.
B
s
.E;L;R/
D
C.R/e
ˇ.EU.R//
.E
U.R//
Π.L
L
a
/
C
.E/ı
s;1
.L
a
L/
CN
.E/ı
s;1
.L
a
L/;
where
.E/
CN
.E/
D
1
For example, we can put .E/
D
.E
E
t
/, with E
t
being a threshold energy.
Then all collisions with the ion energies exceeding E
t
will be ineffective. If E
t
D
0,
the ion capture goes only from bound states of the potential well. This solution
allows us to find the efficiency of the ion recombination.
