Stellenangebote
Ultrafast Dynamics Lab (PhD students, Master students and diploma students)
Research profile:
Our research is focused on studying the structure and dynamics of biochemical systems in solutions. Currently we are using the Bessy II synchrotron as an x-ray light source giving us access to X-ray pulses in an energy range from 100 to 1500 eV. This energy range covers the K-edge of life elements (oxygen, nitrogen, carbon …) as well as the L-edge of transition metals (first row 3d- elements). We have developed spectrometers allowing us to investigate these elements under physiological conditions (room or body temperature and pressure). Note that soft x-rays require ultra high vacuum and it is not trivial to introduce systems under ambient conditions to be investigated there.
Our previous success allowed us to win an ERC-starter grant for investigating ultra-fast dynamics in solution and at interfaces for chemical and biological applications. This will allow us to proceed on the following two pillar approach for pump and probe measurements:
- Using a laser pump- and a X-ray probe-pulse from the synchrotron, measuring either x-ray transmission or fluorescence. Synchrotron radiation will enable a high intensity probe, but limits the time resolution to 50 ps.
- Using a laser pump- and high-harmonic X-ray probe-pulse, using primarily photoelectron spectroscopy with the possibility to extend the technique to X-ray transmission and fluorescence measurements. The X-ray pulse based on high harmonic generation will be limited in intensity but allows a femto-second time resolution.
Desired qualification:
- Experience with high-harmonic generation
- Experience with X-ray spectroscopy, synchrotron radiation, and vacuum systems
For our new research efforts into time resolved spectroscopy as well as synchrotron based x-ray spectroscopy usually several opportunities for a Master or Bachelor thesis exist.
Also Ph.D. positions become periodically available for current possibilities contact:
emad.aziz@helmholtz-berlin.de