Stuttgart 2012 – scientific programme

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A: Fachverband Atomphysik

A 1: Interaction with strong or short laser pulses I

A 1.6: Talk

Monday, March 12, 2012, 12:00–12:15, V55.01

Coulomb interaction in multiphoton ionization of iodine-containing molecules — •Nils Gerken, Stephan Klumpp, Martina Dell’Angela, Florian Sorgenfrei, Florian Hieke, Wilfried Wirth, and Michael Martins — Institut für Experimentalphysik, 22761 Hamburg, Germany

We present multi-ionization processes of Iodine-containing molecules and Xenon in the region of the giant resonance measured with ion mass-to-charge spectroscopy at ultrahigh intensities. In our experiment at the free-electron laser facility FLASH we reached photon intensities of up to 10¹² − 10¹⁴ W/cm² at pulse lengths of a few hundred femtoseconds. We observed different Coulomb interaction schemes due to different charge state distributions at two different molecular types of halides. Especially at Ion TOF - peaks belonging to higher charged Iodine atoms we can clearly observe asymmetries in our Ion time-of-flight spectra caused by Coulomb interaction. Differences of ion charge state yields for two different molecules are only observed when exposing to high photon intensities, this can be an indication for double core hole excitations. We also report on time dependent patterns of atomic xenon which is also caused by resonance excitation behavior.