TY - JOUR

T1 - Diffusion Ionization of the Rydberg Diatomic Quasi-Molecular Complex Formed upon Collisions of Rubidium Atoms

AU - Bezuglov, N. N.

AU - Borodin, V. M.

AU - Grushevskiǐ, V.

AU - Klyucharev, A. N.

AU - Michulis, K.

AU - Fuzo, F.

AU - Allegrini, M.

PY - 2003/10/1

Y1 - 2003/10/1

N2 - The problem of impact ionization of two Rb atoms, one of which belongs to the Rydberg P series and the other of which is in the ground state, is studied and solved with the use of the methods of stochastic dynamics for description of the path instability of a Rydberg electron in a collision diatomic complex. The actual potential of the atomic framework was taken into account in terms of the single-channel quantum-defect method, whose accuracy was demonstrated on the example of determination of the photoionization cross sections in the quasi-classical approximation. A representation of the effective average lifetime of an external electron in the bound state that takes into account both the diffusion migration within the Coulomb crowding of the potential energy curves for the quasi-molecular complex and the direct quantum autoionization is obtained in analytical form. It is shown that the rate constants of diffusion collisional ionization calculated by us are in good agreement with the experimental data.

AB - The problem of impact ionization of two Rb atoms, one of which belongs to the Rydberg P series and the other of which is in the ground state, is studied and solved with the use of the methods of stochastic dynamics for description of the path instability of a Rydberg electron in a collision diatomic complex. The actual potential of the atomic framework was taken into account in terms of the single-channel quantum-defect method, whose accuracy was demonstrated on the example of determination of the photoionization cross sections in the quasi-classical approximation. A representation of the effective average lifetime of an external electron in the bound state that takes into account both the diffusion migration within the Coulomb crowding of the potential energy curves for the quasi-molecular complex and the direct quantum autoionization is obtained in analytical form. It is shown that the rate constants of diffusion collisional ionization calculated by us are in good agreement with the experimental data.

UR - http://www.scopus.com/inward/record.url?scp=0345548596&partnerID=8YFLogxK

U2 - 10.1134/1.1621434

DO - 10.1134/1.1621434

M3 - Article

AN - SCOPUS:0345548596

VL - 95

SP - 515

EP - 524

JO - OPTICS AND SPECTROSCOPY

JF - OPTICS AND SPECTROSCOPY

SN - 0030-400X

IS - 4

ER -