Mainz 2017 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 3: XUV/X-ray spectroscopy I

A 3.2: Vortrag

Montag, 6. März 2017, 15:00–15:15, N 2

Optical control of core hole relaxation dynamics in open shell atoms — •Alexander Achner¹, Tommaso Mazza¹, Carlo Callegari², Stefano Stranges³, and Michael Meyer¹ — ¹European XFEL GmbH, 22869 Schenefeld, Germany — ²Elettra-Sincrotrone Trieste, 34149 Basovizza, Trieste, Italy — ³Università degli Studi di Roma La Sapienza, 00185 Rome, Italy

To explore the relaxation dynamics of resonantly excited core-hole states of atomic iodine, we used XUV pulses from the FERMI FEL in combination with a synchronized near-infrared (NIR) laser. The ionization process was characterized by ion time of flight spectrometry. After resonant 4d excitation by the XUV radiation the NIR laser field is used to probe the excited states as well as the final ionization products. The I^*4d⁹6p and the I^*4d⁹5p resonances (at 55.95 eV and 46.2 eV) were excited by the XUV photons and the dynamics of the electronic decay was probed by varying the relative delay between XUV and NIR. Using only XUV radiation, the resonant excitation is followed by an ultrafast resonant Auger decay leading mainly to singly charged states. Introducing the NIR laser pulses the ionization of the 4d⁹6p resonant state is possible, causing the production of higher charge states via normal Auger process. For the 4d⁹5p resonance the energy difference to the 4d ionization threshold is too high for further ionization with NIR intensities used in the experiment, and therefore only ionization of the excited singly charge states produced via resonant Auger decay was possible.