ELFT HÍRADÓ

[Szeminárium koordinátor <sem-admin AT szfki.hu>]

SZFI SeminarBortel GáborHUN-REN Wigner RCP SZFIAtomic Structure in 
FemtosecondsTuesday, 30 April 2024, 10:00, KFKI Campus, Bldg. 1, 2nd floor, 
Conference RoomX-ray free electron lasers (XFELs) provide 10–100 fs long 
pulses containing 1012–1013 photons in the 5–15 keV photon energy range. 
Although such a pulse contains comparable number of photons to those that are 
used in hours-long single crystal diffraction experiments, the conventional 
experimental techniques are not suitable for measurements using a single XFEL 
pulse. To determine the 3D atomic structure of crystalline materials using a 
single XFEL pulse, new measurement techniques must be developed. X-ray 
fluorescent atoms within a crystalline structure, used as secondary X-ray 
sources for diffraction result in Kossel lines instead of Bragg reflections. 
In this talk I will explain what the fundamental differences are and why it 
is necessary to change from Bragg reflections to Kossel lines in an 
ultrashort single-pulse diffraction measurement. I will describe the 
experimental details, show the steps of structure solution and the results of 
our demonstration experiment performed at the European XFEL [Nature 
Communications (2024) 15:970.]. Minden érdeklődőt szívesen látunk! - 
Everyone is welcome to attend.Attila Nagysem-admin AT szfki.hu