Geoscience Reference
In-Depth Information
Tabl e 1. 2
Total quenching constants of the metastable states of the inert
gas atoms by unexcited alkali atoms and zinc atoms (Klyucharev and
Vujnovic
1990
)
10
10
cm
3
s
1
k
,
Theory
a
Collision partners
T
D
300 K
Experiment
He(2
3
S)
Zn
9.2
5.1
˙
1.5
Na
8.1
7.7
˙
1.5
K
9.0
12.0
˙
2.4
T
D
350 K
Rb
9.1
4.5
˙
0.9
Cs
9.7
4.4
˙
1.6
T
D
450 K
He(2
1
S)
Cs
-
15
˙
6
Ne(
3
P
0
)
-
31
˙
9
T
D
450 K
Ne(
3
P
2
)
9
a
Estimates are obtained in the framework of the polarization model (all
the values of the quenching constants with the exception of the neon atom
can include the components of ionization)
-
30
˙
were carried out by Merz et al. (
1994
) by high-resolution electron spectroscopy,
aimed at increasing of the types of collision partners: hydrogen and deuterium, and
the metastable atoms of heavy inert gases.
The rate constant of the dissociative recombination reaction
8
T
e
1
=
2
Z
K
ˇ
T
i
;T
e
D
ˇ
T
i
;"
exp .
"=T
e
/d"
(1.50)
0
as a inverse process of the AI reaction has been studied earlier in the framework
of the MQD theory (Hasegawa
1988
), where the rate constants of the dissociative
recombination of H
2
C
,HD
C
,andD
2
C
were calculated and a two-temperature
dependence of the rate constant of the dissociative recombination was proposed.
Here T
i
is the rotation molecular temperature,
T
e
is the temperature of electrons, "
is the electron energy, and
ˇ
is the cross section of the reaction.
Note that according to the reported data (Hasegawa
1988
; Balashov et al.
1984
)
the rates of the dissociative recombination for the asymmetrical molecular ions were
correlated with the relevant sections of their formation in the reaction (Eq.
1.49
).
Data obtained from the total quenching constants of metastable states, which
were measured in the afterglow of a pulsed discharge for the reaction PI, involving
the rare gas metastable atoms and the normal atoms Zn, Na, K, Rb, and Cs, are
presented in Table
1.2
. By definition, these results correspond to the upper boundary
values of the process constants. As can be seen from the table, in accordance with the
rule of conservation of total spin angular momentum of the system, the constant k
PI
for the He(2
3
S
1
)
C
Cs(6
2
S
1/2
) pair is greater than for the He(2
1
S
0
)
C
Cs(6
2
S
1/2
)pair.
