Hannover 2016 – scientific programme
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A: Fachverband Atomphysik
A 39: Interaction with VUV and X-ray light
A 39.2: Talk
Friday, March 4, 2016, 11:30–11:45, f303
Two-photon double ionization of Neon using an intense high harmonic source — •Bastian Manschwetus1,3, Linnea Rading1, Fillipo Campi1, Helene Coudert-Alteirac1, Sylvain Maclot1, Lahl Jan1, Piotr Rudawski1, Christoph M. Heyl1, Balasz Farkas2, Mohamed Tarek2, Anne L’Huillier1, and Per Johnsson1 — 1Department of Physics, Lund University, Box 118, SE-22100 Lund, Sweden — 2ELI-HU Non-Profit Ltd., Dugonics tér 13, 6720 Szeged, Hungary — 3Deutsches Elektronen-Synchrotron, Notkestrasse 85, D-22603 Hamburg, Germany
We present first results of two-photon double ionization of neon using an attosecond pulse train (APT) with an intensity of 3x1012 W/cm2 using the high-intensity high harmonic beamline at the Lund High-Power Laser Facility. It allows the efficient generation of an APT in argon or krypton with approximately 1 µJ pulse energy in a spectrum between 17 and 50 eV by loosely focusing up to 80 mJ of infrared pulse energy. Focusing the generated XUV light tightly into a Neon gas jet leads to photoionization and we detect Ne2+ ions with an ion time of flight spectrometer. By changing the spectral shape of the generated harmonic radiation, we can change the contribution from two different double ionization channels and get an indication if the sequential two-photon process or the direct two-photon process is dominant in our experimental conditions. The observation of two-photon double ionization shows that the beamline provides a sufficiently XUV flux to enable pump-probe experiments and we are currently implementing a time delay unit.