Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

A: Fachverband Atomphysik

A 12: Interaction with strong or short laser pulses III

A 12.4: Vortrag

Dienstag, 13. März 2012, 11:30–11:45, V47.03

Time-Resolved Photoelectron Diffraction in Laser-Aligned Molecules at Free-Electron Lasers — •Denis Anielski^1,2, Alaa Al-Shemmary³, Rebecca Boll^1,2, Lauge Christensen⁴, Sankar De⁴, Siarhei Dziarzhytski³, Benjamin Erk^1,2, Jochen Küpper^5,6, Terence Mullins⁵, Harald Redlin³, Daniel Rolles^1,7, Artem Rudenko^1,2, Kirsten Schnorr², Henrik Stapelfeldt⁴, Stephan Stern^5,6, Sebastian Trippel⁵, and Joachim Ullrich^1,2 — ¹Max Planck Advanced Study Group, CFEL, Hamburg — ²MPI für Kernphysik, Heidelberg — ³DESY, Hamburg — ⁴University of Aarhus, Denmark — ⁵CFEL, DESY, Hamburg — ⁶Universität Hamburg — ⁷MPI für medizinische Forschung, Heidelberg

The possibility to obtain femtosecond time-resolved information on single molecules with Angstrom spatial resolution is one of the driving forces for the development of short-pulse VUV and X-ray sources such as FELs. Time-resolved photoelectron diffraction allows to investigate fundamental chemical reaction dynamics in small to medium-sized organic molecules. At FLASH, OCS molecules were adiabatically aligned using a ns Nd:YAG laser (⟨cos²(θ)⟩_2D=0.82), dissociated with a fs Ti:Sa laser and then photoionized by the FEL for different delays between Ti:Sa and FEL. A velocity map imaging spectrometer recorded the angular distributions of the photoelectrons. By comparing these distributions with multiple scattering calculations, the changing geometric structure of the molecule can be made visible.