Darmstadt 2008 – scientific programme

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A: Fachverband Atomphysik

A 31: Interaction with intense laser pulses III: VUV and X-ray light

A 31.5: Talk

Friday, March 14, 2008, 15:00–15:15, 3D

Two-Color Photoionization using High Intensity Extreme-UV Free Electron Laser (FLASH) and Near-IR Laser Pulses — •S. Duesterer¹, P. Radcliffe¹, W. B. Li¹, A. Azima¹, J. Dardis², P. Hough², K.D. Kavanagh², J. T. Costello², D. Glijer³, D. Cubaynes³, and M. Meyer³ — ¹Hamburger Synchrotronstrahlungslabor HASYLAB at Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, D-22607 Hamburg, Germany — ²National Center for Plasma Science and Technology, Dublin City University, Dublin, Ireland and School of Physical Sciences, Dublin City University, Dublin 9, — ³LIXAM/CNRS, UMR 8624 Centre Universitaire Paris-Sud, Bâtiment 350, F-91405 Orsay Cedex, France

Two-photon two-color ionization of rare gases has been measured using an experimental system designed for single-shot photoelectron spectroscopy on free atoms and molecules at the Free Electron Laser in Hamburg (FLASH at DESY). Characteristic sidebands appear in the photoelectron spectra when the optical (Ti:Saph laser: 100 fs, 800 nm) and the FEL pulses overlap spatially and temporally. The cross-correlation curve points to a 250 fs rms jitter between the two sources at the experiment. Our experimental results agree well with theoretical models of the two-color-ATI process and provide more detailed insights into atomic photoionization dynamics.