Hannover 2016 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 22: Interaction with VUV and X-ray light
A 22.18: Poster
Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof
Inner shell excitation of Mn with short intense x-ray pulses — •Stephan Klumpp1,2, Karolin Mertens1, Nils Gerken1, Bernd Sonntag1, Mathias Richter3, Andrey Sorokin2, Markus Braune2, Kai Tiedtke2, Peter Zimmermann4, and Michael Martins1 — 1Dept. Physik, UHH — 2FS-FL, DESY — 3PTB — 4TU Berlin
Within one single pulse of a FEL like FLASH at DESY in Hamburg, with a duration in the order of 10 fs the neutral xenon atom can absorb more than 50 photons and hence can be ionised up to Xe21+. The physics driving the ionisation to this high charge state is still under debate, but it is presumed that the existence of resonances of the neutral atom and the intermediate (highly charged) ions play an important role in the sequential absorption process of so many photons. By varying the atomic target from Xe, with its completely filled 4d subshell, to Mn, with its half filled 3d subshell, we study the influence of the correlative nature of the resonances involved in the photoionisation process. The atomic manganese was therefore excited with two different photon energies using high flux FEL pulses from the BL2 beamline of FLASH. With photons of 23.8 nm (52.1 eV) Mn was excited resonantly in its giant resonance, with photons of 20.3 nm (61.2 eV) non-resonantly above it. m/q spectra were obtained by the means of ion time-of-flight spectrometer depending on the irradiance of the FEL pulses. Charge states of Mn ions up to Mn6+ have been observed at resonant excitation and even up to Mn7+ for non-resonant excitation. The dependence of the m/q spectra can be explained in a sequential excitation scheme.