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Diatomic molecules in intense laser fields: rotational destabilization - a new dissociation mechanism
Art der Abschlussarbeit
Diplomarbeit
Autoren
- Lorenz, Ulf
Betreuer
- Prof. Dr. rer. nat. habil. Rüdiger Schmidt
Abstract
When molecules interact with intense laser fields, different
effects can be found. Besides ionization, these are mainly
dissociation effects, and the alignment of molecules with
respect to the laser polarization vector. In analogue to the
Born-Oppenheimer expansion, the latter effects can be explained in a descriptive way as a motion of the nuclei on Floquet quasienergy surfaces created by the electrons. In
this work, a model is derived that combines a Floquet approach for the electrons with a classical description
of the nuclei using the Tully hopping formalism for electronic transitions. The model is testet against reference calculations. Afterwards, we systematically study
an effect where the rotation of a molecule, i.e. a large
angular momentum, is the prerequisite for its dissociation
(Rotational Destabilization).
effects can be found. Besides ionization, these are mainly
dissociation effects, and the alignment of molecules with
respect to the laser polarization vector. In analogue to the
Born-Oppenheimer expansion, the latter effects can be explained in a descriptive way as a motion of the nuclei on Floquet quasienergy surfaces created by the electrons. In
this work, a model is derived that combines a Floquet approach for the electrons with a classical description
of the nuclei using the Tully hopping formalism for electronic transitions. The model is testet against reference calculations. Afterwards, we systematically study
an effect where the rotation of a molecule, i.e. a large
angular momentum, is the prerequisite for its dissociation
(Rotational Destabilization).
Zugeordnete Forschungsschwerpunkte
- Moleküle und Cluster in intensiven Laserfeldern
Zugeordnete Forschungsprojekte
- Moleküle in intensiven Laserfeldern
Berichtsjahr
2007