Hannover 2016 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 39: Interaction with VUV and X-ray light

A 39.2: Vortrag

Freitag, 4. März 2016, 11:30–11:45, f303

Two-photon double ionization of Neon using an intense high harmonic source — •Bastian Manschwetus^1,3, 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.