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Journals and Conferences
We investigate experimentally the validity of proposed theories extending the tunneling approximation towards the multiphoton regime in strong-field ionization of helium. We employ elliptically polarized laser pulses and demonstrate how the influence of the ion potential on the released electron encoded in the measured observable provides the desired… (More)
We present measurements of single-photon ionization time delays between the outermost valence electrons of argon and neon using a coincidence detection technique that allows for the simultaneous measurement of both species under identical conditions. The analysis of the measured traces reveals energy-dependent time delays of a few tens of attoseconds with… (More)
Free methyl bromide and total bromide residues were determined in potatoes fumigated with methyl bromide. In potatoes fumigated at 180 mg×h/l with methyl bromide at 10 or 18°C after import into the United Kingdom, no free methyl bromide was detectable 24 h after fumigation and total bromide did not exceed 32 ppm.
Here we present a successful combination of an attosecond beamline with a COLTRIMS apparatus, which we refer to as AttoCOLTRIMS. The setup provides either single attosecond pulses or attosecond pulse trains for extreme ultraviolet-infrared pump-probe experiments. We achieve full attosecond stability by using an active interferometer stabilization. The… (More)
We combine an attosecond beamline with a 3D momentum imaging spectrometer to achieve coincidence pump probe experiments with unprecedented attosecond time-resolution. Besides technical details, first coincidence and pump-probe experiments are presented.
Strong field ionization momentum distribution contains much information. The angular distribution indicates real tunneling delay time, the center shows ellipticity dependent Coulomb effects, and the longitudinal momentum spread challenges the assumption of zero initial momentum.