Stuttgart 2012 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 10: Interaction with strong or short laser pulses II

A 10.5: Vortrag

Montag, 12. März 2012, 17:30–17:45, V55.01

Low-energy directional asymmetry in CEP-dependent strong-field photoemission — •Martin Laux, Andreas Kaldun, Christian Ott, Philipp Raith, Kristina Meyer, Claus Dieter Schröter, Robert Moshammer, Joachim Ullrich, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

The experimental setup of a newly-built Cold Target Recoil Ion Momentum Spectrometer (COLTRIMS), also termed as ‘Reaction Microscope’ (ReMi), together with first experimental data and simulations, will be presented. The COLTRIMS method has been in use for more than a decade and is a well established technique to completely resolve the kinematics of ionization reactions by interaction of atoms or molecules in a supersonic gas jet with an electronic, ionic or photonic projectile beam. The single ionization of xenon atoms by a few-femtosecond laser pulse was simulated in dependence on the carrier-envelope phase (CEP) using a model based on the strong-field approximation (SFA). The CEP- and electron-energy-dependent asymmetry of the emission direction strongly depends on pulse duration and intensity of the strong-field laser pulse. The calculated electron momentum distributions are compared to measurements carried out with the new setup. In particular, we focus on the measurement of low-energy photoelectron asymmetry, as it may carry important information about the atomic structure and should be most strongly affected by the Coulomb potential and structure of the remaining ion.