Author:
Gribakin G. F.,Gribakina A. A.,Flambaum V. V.
Abstract
We show that the spectrum and eigenstates of open-shell multicharged atomic
ions near the ionisation threshold are chaotic, as a result of extremely high
level densities of multiply excited electron states (103
eV–1 in Au24+) and
strong configuration mixing. This complexity enables one to use statistical
methods to analyse the system. We examine the dependence of the orbital
occupation numbers and single-particle energies on the excitation energy of
the system, and show that the occupation numbers are described by the
Fermi–Dirac distribution, and the temperature and chemical potential can
be introduced. The Fermi–Dirac temperature is close to the temperature
defined through the canonical distribution. Using a statistical approach we
estimate the contribution of multielectron resonant states to the radiative
capture of low-energy electrons by Au25+ and
demonstrate that this mechanism fully accounts for the
102 times enhancement of the recombination over the
direct radiative recombination, in agreement with recent experimental
observations.
Subject
General Physics and Astronomy
Cited by
43 articles.
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