Time resolved physics at extreme time scales
new ANKA seminar room, building 348, upper floor
Svetoslav Stankov, KIT-IPS
CFEL, Hamburg, Germany
The advances in ultrafast optics over the last decade have made available light pulses as short as a few femtoseconds [1, 2] which are practically at the limit set by the laser field oscillation cycle in the visible spectral range. Utilizing these pulses for high order harmonics allow to generate isolated attosecond XUV pulses [3, 4] and give access to measure dynamics on an attosecond timescale in real time.
Many-body systems with excess internal energy relax towards states of lower energy by rearrangement of molecular, atomic or nuclear structure. Observing these processes in real time requires a pump pulse for initiating the microscopic dynamics and a delayed probe pulse for detecting transition states of the evolved system. Usually these processes evolve at timescales in the range of 1 as up to a few femtoseconds depending on the energy of the core hole and the strength of the electronic coupling.
The field of time resolved x-ray science and attosecond science in particular which celebrated its first decade recently, opened the door to watching and controlling these hitherto inaccessible dynamics in the time domain.
This talk will discuss the tracing of inner atomic rearrangement [5, 6] and time resolved photoemission  with respect to different physical questions and related detection schemes.
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