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Rydberg complex XY ** is accompanied by a transition to the highly excited
states with large angular momentum N . Their energy level positions are different
appreciably from the states close to the regular distribution.
Classical motion of nuclei along the random trajectories converged at pseudo-
crossing points of the potential curves of the Rydberg and dissociative configura-
tions should correspond to the dynamic “quantum chaos.” However, this scenario
is totally unsuitable, because representation of the potential curves lying near the
ionization continuum is not applicable. Therefore, the motion of the quantum system
takes place in time for the energy levels to be irregularly arranged because of the
strong nonadiabatic coupling of the electron and nuclear motions.
However, it should be borne in mind that the intermediate states with large
principal quantum numbers n make a small contribution to the dynamics of the AI
process. On the one hand, as was shown, there is a dynamic factor ( 1.40 ). On the
other, this region of the spectrum is passed fairly quickly, because the characteristic
energy transfer for a certain period of time is much greater than the distance between
closely spaced levels, including levels of the autoionizing states of the continuum,
despite the fact that in this region of motion resulting from the inclusion of direct
transitions in the ionization continuum, diffusion approximation is formally not
applicable, and the total contribution to the diffusion flow is small here (Golubkov
et al. 1979 ).
Our theoretical model is supplemented with an extended review of experimental
data on AI constants measured under a vapor cell, a single atomic beam, and
crossing-beam conditions. Various colliding pairs involving both low-lying and
highly excited (Rydberg) states are considered here, with discussion provided on the
corresponding features of the accompanying AI processes. A proper understanding
of the presented experimental findings within the framework of the theoretical treaty
developed here is important for our further activity.
No. 247475.
Adamson SO, Buenker RG, Golubkov GV et al (2009) Laser stimulation of low-temperature
dissociative recombination of dissociative recombination of electrons and oxygen molecular
ions. Russ J Phys Chem B3(2):195-210
Amthor T, Denskat J, Giese C et al (2009) Autoionization of an ultracold Rydberg gas through
resonant dipole coupling. Eur Phys J D53:329-335
Balashov EM, Golubkov GV, Ivanov GK (1984) Radiative transitions between Rydberg states of
molecules. Sov Phys JETP 59(6):1188-1194
Barbier L, Djerad MT, Cheret M (1986) Collisional ion-pair formation in an excited alkali-metal
vapor. Phys Rev A34:2710-2718
Barbier L, Pesnelle A, Cheret MJ (1987) Theoretical interpretation of penning and associative
ionization in collisions between two excited rubidium atoms. J Phys B28:1249-1260
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