Hannover 2016 – scientific programme
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A: Fachverband Atomphysik
A 22: Interaction with VUV and X-ray light
A 22.16: Poster
Tuesday, March 1, 2016, 16:30–19:00, Empore Lichthof
Directional control of the photodissociation of SF6 by using THz and XUV fields — •Severin Meister1, Georg Schmid1, Sven Augustin1, Kirsten Schnorr1, Hannes Lindenblatt1, Yifan Liu1, Viktor Adam1, Ann-Sophie Hilkert1, Patrick Paluch1, Artem Rudenko2, Matthias Kübel3, Christian Burger3, William Okell3, Matthias Kling3, Torsten Golz4, Nikola Stojanovic4, Thomas Pfeifer1, Claus-Dieter Schröter1, and Robert Moshammer1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Deutschland — 2Kansas State University, Manhattan, USA — 3Ludwig Maximilians Universität, München, Deutschland — 4DESY, Hamburg, Deutschland
In a two-color coherent-control experiment at FLASH, we used a THz pulse to excite anti-symmetric vibrational modes in SF6 and singly ionized the molecule with a delayed 60 eV XUV pulse. The emission direction of the emitted F atom is controlled by the phase of the superimposed stretching vibrational modes. The ionization leads to a Coulomb explosion, fragmenting mainly in SF5+ and F. As a result the directionality of the de-halogenation can be controlled, which manifests as an asymmetric ejection of F atoms along the laser polarization. The experiment was performed with a Reaction Microscope (REMI), where all charged fragments (e−, F, SF5+) can be detected in coincidence and their associated momenta reconstructed. An oscillation in the preferential direction (along the polarization direction of the THz pulse) of the F emission, as a function of pulse delay Δt, serves as the signature of the successful control of the dissociation direction.