Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 15: Poster: Interaction with strong or short laser pulses
A 15.2: Poster
Montag, 17. März 2014, 16:30–18:30, Spree-Palais
Time resolved investigation of non-sequential double ionization using two-color laser-pulses — •Nicolas Camus1, Lutz Fechner1, Andreas Krupp1, Joachim Ullrich1,2, Thomas Pfeifer1, and Robert Moshammer1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg — 2Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig
We present an experiment where two laser pulses (800+400 nm) with controllable time-delay are used to investigate double ionization of atoms. The polarization of the weaker blue field is chosen to be perpendicular to the one of the more intense IR field. Due to the different intensities, ionization is assumed to result from the red component with the blue field causing a streaking of the electrons in the transverse direction. Information about the time the electrons escape can be extracted from the momentum component parallel to the blue field and its variation with the relative phase between the laser pulses. Using a Reaction Microscope, we are able to measure the three-dimensional momentum vectors of all particles in coincidence and determine the streaking traces as a function of the time-delay. Applied to non-sequential double ionization we are able to distinguish and to identify different ionization pathways.