Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 28: Poster: Interaction with VUV and X-ray light II

A 28.13: Poster

Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer

Time Resolved Electron- and Ion-Spectroscopy of Iodine Containing Molecules — •Karolin Mertens¹, Nils Gerken¹, Stephan Klumpp¹, Ivan Baev¹, Tommaso Mazza², Alberto De Fanis², Michael Meyer², and Michael Martins¹ — ¹Physik Department, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg — ²European XFEL, Notkestrasse 85, 22607 Hamburg

Using the intense soft x-ray laser pulses from FLASH, we have studied the photofragmentation and ionization behavior of small iodine containing molecules with the goal to investigate charge redistribution processes as well as the time scales of the involved dissociation processes. The molecules CH3I and CH2I2 have been chosen as model systems, as a strong local core hole excitation can easily be generated at one or two different iodine sites of the molecules by tuning the photon energy to the strong 4d-4f shape resonance. The photoionization- and dissociation process is studied by ion time-of-flight spectroscopy. We present first results of measurements with a XUV-pump-XUV-probe setup. By using a Mach-Zehnder type split- and delay setup it is possible to track the development of the different ionic charge states of the molecule fragments depending on the time delay between two XUV pulses. Delay-dependent intensity changes in the iodine ion charge states are a clear indication of charge migration processes within the molecule. We also present preliminary photoelectron spectra of these systems measured with a magnetic-bottle type of spectrometer. This work is supported by the collaborative research center SFB 925 "Light induced dynamics and control of correlated quantum systems".