Hannover 2016 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 39: Interaction with VUV and X-ray light
A 39.5: Vortrag
Freitag, 4. März 2016, 12:15–12:30, f303
Phase retrieval algorithms to reveal the temporal structure of the electron photoemission from atoms and clusters. — •Tim Oelze1, Bernd Schütte2,3, Jan Lahl4, Stefan Apostel1, Arnaud Rouzée2, Marc Vrakking2, and Maria Krikunova1 — 1Berlin Institute of Technology — 2Max Born Institut Berlin — 3Imperial College London — 4Lund University
Light field streaking is a very powerful technique for the temporal characterization of ultrashort extreme ultraviolet (XUV) pulses. Upon ionization of atoms by the XUV pulse the electron distribution is created as a replica of the XUV pulse. In the presence of an oscillating electric field the released electrons acquire an additional momentum i.e. become streaked by the laser dressing field. By measuring electron spectra at different time-delays between the ionizing XUV pulse and the dressing field a streaking spectrogram is then obtained. It contains information about the temporal structure of the electron photoemission. Various algorithms can be then applied to retrieve the time and energy distribution of the electron photoemission from measured spectra. In our experiment argon atoms and medium-sized clusters were ionized by intense femtosecond XUV pulses produced through the high harmonic generation (HHG) and a single-cycle terahertz (THz) field is used for streaking. In this talk an iterative and a non iterative algorithm are compared by their performance on reconstruction of the streaked spectra. A particular focus of the talk is on the discussion of data post-processing routines needed to achieve reliable reconstruction results from measured spectra.