264 research outputs found
Electron loss of fast heavy projectiles in collision with neutral targets
The multiple electron loss of heavy projectiles in fast ion-atom collisions
has been studied in the framework of the sudden perturbation approximation.
Especially, a model is developed to calculate the cross sections for the loss
of any number of electrons from the projectile ion, including the ionization of
a single electron and up to the complete stripping of the projectile. For a
given collision system, that is specified by the (type and charge state of the)
projectile and target as well as the collision energy, in fact, the
experimental cross sections for just three final states of the projectile are
required by this model in order to predict the loss of any number, , of
electrons for the same collision system, or for any similar system that differs
only in the energy or the initial charge state of the projectile ion. The model
is simple and can be utilized for both, the projectile and target ionization,
and without that large computer resources are requested. Detailed computation
have been carried out for the multiple electron loss of Xe and
U projectiles in collision with neutral Ar and Ne gas
targets
Relativistic quantum dynamics in strong fields: Photon emission from heavy, few-electron ions
Recent progress in the study of the photon emission from highly-charged heavy
ions is reviewed. These investigations show that high- ions provide a unique
tool for improving the understanding of the electron-electron and
electron-photon interaction in the presence of strong fields. Apart from the
bound-state transitions, which are accurately described in the framework of
Quantum Electrodynamics, much information has been obtained also from the
radiative capture of (quasi-) free electrons by high- ions. Many features in
the observed spectra hereby confirm the inherently relativistic behavior of
even the simplest compound quantum systems in Nature.Comment: Version 18/11/0
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