Environmental Engineering Reference
In-Depth Information
Ta b l e 2 . 4
Electron scattering lengths for scattering by alkali metal atoms
L
0
and
L
1
,andthe
parameters of the autodetaching state
3
P
for the negative alkali metal ion with a spin of 1 [33].
Li
Na
K
Rb
Cs
L
0
/
a
0
3.6
4.2
0.56
2.0
-2.2
L
1
/
a
0
-5.7
-5.9
-15
-17
-24
E
r
, eV
0.06
0.08
0.02
0.03
0.011
Γ
r
, eV
0.07
0.08
0.02
0.03
0.008
Figure 2.7
The diffusion cross section of
electron scattering by a xenon atom as a func-
tion of the electron energy. Experimental data:
solid curve - [37], open circles - [38], dot-
ted curve - [39], black triangles - [40], black
squares - [41]; the black rhombi give the cross
sectionatzeroenergyattheminimuminac-
cordance with (2.32) and the data in Table 2.3.
form of expansion over a small electron wave vector
q
[42, 43]. This expansion is
based on a small parameter
q
/
La
0
(
a
0
is the Bohr radius), and accounting for the
first term of this expansion leads to the following expression for the diffusion cross
α
Figure 2.8
The dependence on the electron energy for the diffusion cross section of electron
scattering by atoms of inert gases [34] according to measurements.
