An electronic structure of the doubly-charged negative ion is depicted in the Dirac- and Lorentz-bubble potential models C60 A variational method was used to investigate it. The overall energy of the system is negative even in the first approximation of this method when a trial wave function of the two electrons is represented as a product of one-electron functions, indicating the existence of a stable state of the doubly-charged negative ion in these models. According to estimates, C60 second electron affinity is around ε2 ≈ 1 eV. This ion's photodetachment cross sections σ(ω) have also been determined. Near the threshold σ(ω), strange and intriguing behaviour is observed. Near the process threshold, the first cross section accompanied by the transition of the doubly-charged negative ion into a singly-charged one is exponentially small. The photodetachment of a singly-charged ion is represented by the second cross section, which increases as a power function of the photoelectron's kinetic energy near the threshold. The photodetachment cross sections of atomic ions with the same electron affinity are of the same order as these cross sections.
Author (s) DetailsA. S. Baltenkov
Arifov Institute of Ion-Plasma and Laser Technologies Tashkent, 100125, Uzbekistan.
A. Z. Msezane
Center for Theoretical Studies of Physical Systems, Clark Atlanta University, Atlanta, Georgia 30314, USA.
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