Hannover 2013 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 5: Attosecond physics
A 5.4: Vortrag
Montag, 18. März 2013, 15:00–15:15, B 305
Kinematically complete photoionization studies with online monitoring of XUV attosecond pulse properties — •Michael Schönwald1, Philipp Coerlin1, Andreas Fischer1, Alexander Sperl1, Arne Senftleben1, Thomas Pfeifer1, Joachim Ullrich1,2, and Robert Moshammer1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Deutschland — 2Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Deutschland
We are producing attosecond pulses (AP) via high harmonic generation (HHG) in a small gas cell filled with rare gases in order to do pump-probe experiments in a reaction microscope (ReMi). A self-phase modulation hollow fiber filled with Neon in combination with a chirped mirror compressor is used to broaden the spectrum and to shorten the infrared (IR) laser pulses from 30 fs to less than 10 fs for experiments with single AP. We perform kinematically complete experiments using a Reaction Microscope (ReMi) which require long-term stability of the incoming radiation. To monitor the HHG spectra and to be able to estimate the pulse durations of the AP, we build a new extended ultraviolet (XUV) spectrometer which uses the light transmitted through the interaction region of the ReMi. A spherical mirror is then used to focus the high harmonics onto a MCP detector. Before hitting the detector the XUV radiation is spectrally resolved by a reflection grating. We will show first experiments in which we combine the information given by the spectrometer and by an optical autocorrelation of the IR laser field. With the online monitoring we are able to perform and to compare experiments with different pulse durations.