Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 16: Atomic clusters (with A)

MO 16.5: Vortrag

Donnerstag, 20. März 2014, 11:45–12:00, BEBEL E44/46

THz field streaking implemented to studies of rare gas clusters — •T Oelze¹, B Schütte², M Müller¹, J P Müller¹, M Sauppe¹, L Flückiger¹, D Rupp¹, M Wieland³, U Frühling³, A Al-Shemmary⁴, N Stojanovic⁴, T Möller¹, M Drescher³, and M Krikunova¹ — ¹IOAP TU Berlin — ²MBI — ³IEXP Uni Hamburg — ⁴HASYLAB@DESY

Coherent, ultrashort and high flux photon pulses in the short-wavelength regime from free-electron lasers enable a wide range of experiments to study the interaction between light and matter with high spacial and temporal resolution. In our experiment at FLASH rare gas clusters were used as size-scalable model systems and were irradiated by XUV pulses at 92 eV in the presence of a THz field. At the beginning of the FEL pulse photoionized electrons escape the cluster leaving a positive charge behind. As a result further electron emission becomes frustrated and an electron nanoplasma is formed. Field-driven streaking camera allows to study how the temporal structure of the electron photoemission is altered by the cluster environment. In this approach the momentum of emitted electrons is changed according to the phase of the electric field of the THz radiation. Photoelectron spectra taken at different phases of the THz field are then used to create streaking spectrograms. From these spectrograms the temporal structure of the electron photoemission can be reconstructed providing insight into the nanoplasma formation.