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Projekt Druckansicht

Electrons in Strong Fields Generated by Atomic Systems and Lasers

Antragsteller Dr. Alexander B. Voitkiv
Fachliche Zuordnung Optik, Quantenoptik und Physik der Atome, Moleküle und Plasmen
Förderung Förderung von 2009 bis 2013
Projektkennung Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 117370968
 
Erstellungsjahr 2014

Zusammenfassung der Projektergebnisse

This project aimed at the theoretical exploration of a number of important aspects of the behaviour of electrons in relativistic collisions of highly charged ions with atoms and in the combined field of a highly charged nucleus and a very intense laser field. Concerning the part on ion-atom collisions, the main achievements of the project are the following. We have proposed two models for projectile-electron excitation and loss: one of them for collisions with many-electron atoms at intermediately large impact energies, where both the screening of the atomic nucleus by atomic electrons and higher order contributions in the interaction with the atom should be taken into account, and the other one for collisions with light atoms at large momentum transfers. The description of two-electron transitions in the projectile ion was also addressed using the relativistic symmetric eikonal model. A highly correlated process of transfer ionization in fast (including relativistic) collisions with highly charged ions was explored and novel effects were predicted. In the part on the electron motion in the fields of a highly charged ion and a strong laser field the main results include the extensions of theories of laser-assisted inelastic electron-ion scattering and radiative electron recombination in a laser field to the relativistic domain. We also found an approximate analytic solution describing the motion of a relativistic electron under the simultaneous action of the Coulomb and laser fields which becomes exact when the Coulomb field is generated by a charged particle moving with the speed of light. During the work on the project we obtained some quite unexpected results with two of them as follows. First, despite the huge difference in mass (and thus impact energy) between electrons and protons, it turned out that electrons can be much more effective in producing excitations of very highly charged ions than equi-velocity protons. Second, in the field of fast ion-atom collisions it has been taken for granted that large transverse momentum transfers correspond to collisions with small impact parameters and vice versa. Such a correspondence, however, completely vanishes when one considers the Coulomb corrections (higher-order contributions) in ultra-relativistic collisions: these corrections come from collisions with very small impact parameters and, simultaneously, from collisions with extremely small transverse momentum transfers.

Projektbezogene Publikationen (Auswahl)

 
 

Zusatzinformationen

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