Stuttgart 2012 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 22: Poster: Interaction with strong or short laser pulses

A 22.9: Poster

Dienstag, 13. März 2012, 16:30–19:00, Poster.V

Energy Quantization in double-ionization of Helium — •Kevin Henrichs, Markus Schöffler, Till Jahnke, Hendrik Sann, Maksim Kunitzki, Martin Pitzer, Christoph Goihl, and Reinhard Dörner — Institut für Kernphysik, Frankfurt (Main), Germany

ATI("above-threshold-ionization")-peaks in single-ionization have been recorded several times. In double ionization they haven*t been observed so far, but should show up in the sum-energy of the two electrons. So far the explanation is the limited energy resolution. Therefore we use a laser with a wavelength of 400 nm instead of 800 nm to increase the energy spacing of the ATI-peaks from 1.5 to 3 eV. The laser is focused on a pre-cooled super sonic gas jet. Created electrons are projected onto position and time sensitive detector using a weak electric and for guidance also a magnetic field. Helium ions are projected onto a second detector and measured in coincidence with the electrons. With this information we calculate the three-dimensional momentum vectors of the participating particles and their energies.