Hannover 2016 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 2: Collisions, Energy transfer and ab initio Modelling

MO 2.2: Vortrag

Montag, 29. Februar 2016, 11:15–11:30, f142

Incoherent photoelectron scattering in above threshold ionization of dense media — •Martin Wilke, Ruba Al-Obaidi, Igor Yu. Kiyan, and Emad F. Aziz — Institute for Methods for Material Development and Joint Ultrafast Dynamics Lab in Solutions and at Interfaces (JULiq) at Helmholtz-Zentrum Berlin, and Freie Universität Berlin, FB Physik, Berlin, Germany

We report on how the typical cutoff laws of fast electron emission by high-intensity ionization processes of single molecules as above-threshold ionization (ATI) and high-order ATI (HATI) can be substantially violated by laser-assisted electron scattering (LAES) on neighboring molecules. Such collective effects occur during the ionization process on the time scale of few laser cycles (40 fs at 1300 nm) in dense media. Above a certain density threshold electron heating by inelastic scattering even dominates the fast photoelectron emission by strong laser fields. Recording photoemission spectra in UHV and providing gas densities of a few millibars and liquids as target is enabled by the liquid micro-jet technique. A study of strong field ionization for different densities and solvents in gas and liquid phase was performed and supported by numerical calculations.