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A: Fachverband Atomphysik

A 9: Interaction with Strong or Short Laser Pulses I

A 9.5: Vortrag

Dienstag, 3. März 2009, 12:00–12:15, VMP 6 HS-C

Interference phenomena in strong field ionization of noble gas dimers — •Bastian Manschwetus¹, Horst Rottke¹, Günter Steinmeyer¹, Armin Czasch², Lutz Foucar², Rainhard Dörner², Horst Schmidt-Böcking², and Wolfgang Sandner¹ — ¹Max-Born-Institute, Max-Born-Str. 2A, D-12489 Berlin — ²Institut für Kernphysik, Johann-Wolfgang-Goethe- Universität, Max-von-Laue-Str.1, D-60438 Frankfurt am Main

Strong-field photoionization of argon, krypton and xenon dimers by a 30 fs laser pulse (λ = 800 nm) is investigated below the saturation intensity of the respective atom using electron-ion coincidence momentum spectroscopy. The dimers undergo single or double ionization, resulting in either a molecular ion or Coulomb explosion of the dimer.

The momentum distribution of the photoelectrons from single ionization of the dimers shows a prominent feature originating from the two center structure of the dimers. This feature can not be reproduced completely by a SFA based simulation, which incorporates 2-center interference [1]. More complex electron dynamics during the ionization process may be responsible for the observed deviations.

Coulomb explosion allows the investigation of double ionization of the dimers with fixed in space molecular axis. The atomic ions angular distribution is nearly isotropic (see also [2]). Their kinetic energy distribution is very sharp and corresponds to the Coulomb repulsion energy at the equilibrium internuclear separation of the neutral dimer.

[1] Z.Ansari et al., New Jour. of Phys. 10, 093027 (2008)

[2] S. Minemoto and H. Sakai, Phys. Rev. A 75,033413 (2007)