Sideband and angular distribution oscillation of photoelectrons observed with XUV/IR 3D momentum imaging spectroscopy

Abstract

Noble gas atoms can be ionized by irradiation with an extreme-ultraviolet (XUV) attosecond pulse train emitting electron wave packets. The attosecond pulse trains can be characterized by superimposing the XUV and its generating, fundamental IR field and considering the energy transfer to the electron wave packets as a function of time delay between both fields, resulting in oscillating energy-sidebands. The three-dimensional dynamics of the photoelectrons however can now be studied in more detail by combining the XUV light source with a Reaction Microscope. In this context we changed the polarisation of the XUV and the IR fields with respect to each other by 90°, detecting a remarkable change of the angular distribution of the sideband-photoelectrons. © Springer-Verlag Berlin Heidelberg 2012.