Environmental Engineering Reference
In-Depth Information
Figure 4.12 gives the dependence on the electric field strengths for the ion drift
velocity in the hydrogen case [69], and Figure 4.13 shows the dependencies on the
reduced electric strength for the mobility of hydrogen and deuterium ions in par-
ent gases [70]. In addition, Figure 4.14 represents the same dependencies for the
mobilities of nitrogen ions in nitrogen [71, 72]. In all the cases, different types of
ions are characterized by different mobilities and may be separated by the mobility.
The relative concentration of ions of different types is determined by the equi-
librium constant
K
for the process of transition between these ions. In the simple
case of ions of inert gases at room temperature, we have atomic
A
C
and molecular
A
2
ions with an equilibrium between them according to the scheme
A
C
C
A
2
A
$
.
Correspondingly, the equilibrium constant
K
for this transition is given by (1.55)
and has the following form:
μ
1
exp
exp
,
3/2
B
T
[
A
C
][
A
]
[
A
2
]
D
g
a
g
C
g
mol
T
„
T
D
T
K
D
(4.107)
2
π
„
2
Figure 4.12
The drift velocity of positive hydrogen ions in hydrogen [69].
Figure 4.13
The mobility of H
C
and H
3
ions in hydrogen and D
C
and D
3
ions in deuteri-
um [70].
