Hannover 2013 – scientific programme

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A: Fachverband Atomphysik

A 42: Poster: Attosecond physics

A 42.4: Poster

Thursday, March 21, 2013, 16:00–18:30, Empore Lichthof

Generation of few-femtosecond monochromatized XUV-pulses for ultrafast pump-probe studies in gas and liquid phase — •Markus Kubin¹, Martin Eckstein¹, Fabio Frassetto², Johan Hummert¹, Kathrin Lange¹, Luca Poletto², Chung-Hsin Yang¹, Julius Zielinski¹, Marc Vrakking¹, and Oleg Kornilov¹ — ¹Max-Born-Institut, Berlin — ²LUXOR, Padova, Italy

High harmonic generation (HHG) driven by femtosecond (fs) lasers provides ultrashort XUV pulses with a comb-like spectrum with photon energies reaching several keV. In combination with pump-probe VIS/XUV photoelectron and photoion spectroscopy it helps to follow chemical reactions in real time on fs- to attosecond-scales. However, the broad spectrum of HHG often launches dynamics on many potential energy surfaces and poses challenges for retrieving useful information from the spectra. In grating-based monochromators - used to narrow the spectrum of HHG sources - dispersion stretches the XUV pulses in time. Here we report on the implementation of a two-stage time-compensating monochromator to deliver XUV pulses with photon energies up to 50 eV and pulse durations around 10 fs. The setup allows for VIS/XUV pump-probe photoelectron and photoion spectroscopy in gas phase and condensed phase (employing the liquid micro-jet technique). The spectral and temporal performance of the system will be discussed in the context of IR-assisted ionization of rare gas atomic samples.