Stuttgart 2012 – scientific programme
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A: Fachverband Atomphysik
A 12: Interaction with strong or short laser pulses III
A 12.4: Talk
Tuesday, March 13, 2012, 11:30–11:45, V47.03
Time-Resolved Photoelectron Diffraction in Laser-Aligned Molecules at Free-Electron Lasers — •Denis Anielski1,2, Alaa Al-Shemmary3, Rebecca Boll1,2, Lauge Christensen4, Sankar De4, Siarhei Dziarzhytski3, Benjamin Erk1,2, Jochen Küpper5,6, Terence Mullins5, Harald Redlin3, Daniel Rolles1,7, Artem Rudenko1,2, Kirsten Schnorr2, Henrik Stapelfeldt4, Stephan Stern5,6, Sebastian Trippel5, and Joachim Ullrich1,2 — 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.