Ultrafast electron diffraction

Shiny metallic vacuum chamber and various optics on a table
Vacuum system for the ultrafast electron diffraction

The femtosecond spectroscopy, i.e. the observation of light-induced dynamics, is widely based on indirect spectroscopy techniques that often allow for only a small window of observation on the dynamic, due to selection rules, Franck-Condon arguments or the occurrence of "dark State". In contrast, the ultrafast electron diffraction (UED) has the potential to follow the core movement or lattice vibration directly after optical excitation. In particular, the transient dynamics is directly accessible after and during stimulation with shaped laser pulses.

 

We have constructed and characterized a unique compact UED setup. Currently, we conduct experiments on freestanding Graphene and generally on free-standing two-dimensional layer systems.

Four pictures show a Graphene sample lying on a grid. There are microscopic images and the diffraction image
Optical image of a self-made 3 nm thick, free-standing, single crystalline graph sample and corresponding electron diffraction pattern

The following employees are currently involved in this topic. To their specific projects see the link "further information":
Picture of M. Sc. (Chemie) Marlene  Adrian
M. Sc. (Chemie) Marlene Adrian
▶ Ultraschnelle Elektronenbeugung an mehrlagigen Heterostrukturen
Telephone +49 561 804-4129
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Picture of Dipl.-Nano. Silvio  Morgenstern
Dipl.-Nano. Silvio Morgenstern
▶ Ultraschnelle Elektronenbeugung an Graphen
Telephone +49 561 804-4129
Placeholder Male
M. Sc. Physik Arne Ungeheuer
Telephone +49 561 804-4129