Electron, Positron and Photon Collisions with Atoms and Molecules
Electronion recombination
Electron
recombination with multicharged ions such as Au25+ or U28+,
has been regarded as a puzzle for a number of years, due to
very high recombination rates and lack of clear resonance
structure. Based on the ideas of manybody quantum chaos [V.
V. Flambaum, A. A. Gribakina, G. F. Gribakin, and M. G. Kozlov,
"Structure of compound states in the chaotic spectrum
of the Ce atom: localization properties, matrix elements,
and enhancement of weak perturbations", Phys. Rev. A
50, 267 (1994)], a statistical theory of electron recombination
with complex ions has been developed [V. V. Flambaum, A. A.
Gribakina, G. F. Gribakin, and C. Harabati, "Electron
recombination with multicharged ions via chaotic manyelectron
states", Phys. Rev. A 66, 012713 (2002)]. Its main assumptions
and the properties of chaotic manyelectron states have been
tested and verified in numerical calculations of the Au24+
compound ion [G. F. Gribakin and S. Sahoo, "Mixing of
dielectronic and multiplyexcited states in electronion recombination:
a study of Au24+", J. Phys. B 36, 3349 (2003)]. In addition
with have identified and examined another recombination mechanism
due to target ion polarization by the incident electron [A.
V. Korol, G. F. Gribakin and F. J. Currell, "Effect of
target polarization in electronion recombination", Phys.
Rev. Lett. 97, 223201 (2006)]. In most cases stidied this
mechanism leads to a systematic enhancement of the recombination
rate in the energy ranges void of dielectronic resonance,
which is usually assumed to be described by simple radiative
recombination.
We
have also proposed that electronion recombination can be
used to study the parity nonconservation due to the fundamental
electronnucleus weak forces in elelctron collisions, and
estimated the size of this effect for highlycharged hydrogenlike
ions [G. F. Gribakin, F. J. Currell, M. G. Kozlov and A. I.
Mikhailov, "Parity nonconservation in electron recombination
of multiply charged ions", Phys. Rev. A 72, 032109 (2005)].
