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spectrum picture are included in the consideration. For example, in the presence

of predissociative valent configurations their level widths could exceed significantly

the distance between the Rydberg levels (Golubkov and Ivanov
1990
). Giving all

these circumstances, the approach developed by Lombardi and Seligman (
1993
)

should be regarded as a model, although not without its appeal.

The science of “quantum chaos,” having been actively developed during the past

20 years, is still fairly young. As we can see, it is still far from completeness for

investigating molecular systems. As in the stationary formulation of the problem

random effects are absent, and the quantum mechanics of excited molecules is in

itself a complex and self-discipline, chaotic solutions can occur in exotic situations

using the approximate approaches only. The ranges of applicability of these ap-

proximations are not always obvious, although sometimes they can lead to positive

results. This limitation is especially true of the Coulomb problem, where a striking

example of this kind is the coincidence of the results of the numerical calculations of

the dipole elements (Picart and Edmonds
1979
), and of analytical ones (Golubkov

et al.
1996b
), obtained in the semiclassical approximation, respectively.

1.5

Chemo-Ionization Involving Atoms in Low-Lying

Excited States

Let us now discuss the experimental facts accumulated over the past two decades

that are an illustration of the theory just presented and put it ahead of fundamentally

new problems. Therefore it is natural that we begin with a presentation of the results

obtained for the AI and PI reactions involving atoms in low-lying excited states.

1.5.1

Metastable Atoms

1.5.1.1

Pair Collisions of Metastable Atoms of Inert Gases

Shock radiation kinetics of plasma taking into account the electron-atom and photo

processes does not overlap all possible types of the charged particle balance in the

plasma. For example, the ionization processes involving He(2
3
S) atoms can proceed

through the following channels:

He
2
3
S
C
He
2
3
S
!
He
C
C
He
C
e

PI

(1.45)

!
He
2
C
C
e

AI

(1.46)

He
2
3
S
He
2
1
S
!
He
C
C
He
C
e

PI

(1.47)

!
He
2
C
C
e

AI

(1.48)