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30.04.2019 - Till Jahnke "Molecular Movies made with Synchrotrons and X-Ray Free Electron Lasers"

Prof. Dr. Till Jahnke, Institute for Experimental Atomic Physics, Goethe University, Frankfurt
When Apr 30, 2019
from 06:00 PM to 07:00 PM
Where Physics high rise, Hermann Herder Str. 3, HS II
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Molecular Movies made with Synchrotrons and X-Ray Free Electron Lasers

 

With the implementation of the European X-ray free electron laser a unique tool for time-resolved studies of small molecules and clusters emerges. The targeted pulse durations and photon energies will enable investigations which, firstly, involve more tightly bound K-shell electrons of common small molecules as N2, CO or hydrocarbons, and secondly, address typical timescales of molecular decay process in the low fs-regime.

By means of coincidence detections techniques as, for example, Cold Target Recoil Ion Momentum Spectroscopy (COLTRIMS) [1] the molecular time domain is already accessible in measurements using synchrotron radiation in some cases. The talk will start with an introduction to the field and the experimental technique. Secondly, several examples of such time-resolved coincidence measurements will be presented. Investigations of the temporal evolution of an electron orbital during the dissociation of a small molecule will be shown. A ‘true’ molecular movie will be presented depicting the nuclear dynamics of small clusters as these deexcite in Interatomic Coulombic Decay. A novel experimental approach, which has been termed PCI-streaking [2], was employed to access the molecular time domain in the latter case. Most recent results from the commissioning of the SQS-COLTRIMS-Reactionmicroscope endstation will be presented including temporal imaging of double core hole creation in oxygen molecules. The talk will end with an outlook on molecular movies which will become possible in the nearest future by showing recent results on Coulomb Explosion Imaging of Iodopyridine.      

 

References

[1]  R. Dörner, V. Mergel, O. Jagutzki, L. Spielberger, J. Ullrich, R. Moshammer, and H. Schmidt-Böcking, Cold target recoil ion momentum spectroscopy: a ‘momentum microscope’to view atomic collision dynamics, Phys. Rep. 330, 95 (2000).

[2]  F. Trinter, J. B. Williams, M. Weller, M. Waitz, M. Pitzer, J. Voigtsberger, C. Schober, G. Kastirke, C. Müller, C. Goihl, P. Burzynski, F. Wiegandt, T. Bauer, R. Wallauer, H. Sann, A. Kalinin, L. Ph. H. Schmidt, M. Schöffler, N. Sisourat, and T. Jahnke, Evolution of Interatomic Coulombic Decay in the Time Domain, Phys. Rev. Lett. 111, 1234 (2013).