Research

Performance of the microscope in the stroboscopic mode


Image resolution with photoelectrons (no laser excitation of the object):


research
Lattice images with an information limit below 0.23 nm have been obtained (laser repetition frequency 2 MHz, UV laser power 15 mW).


Energy resolution with photoelectrons (no laser excitation of the object):

gaussZero-loss peak with a width of less than 0.7 eV (laser repetition frequency 2 MHz, UV laser power 1 mW)


Synchronization of pump and probe pulses with photon-induced near field electron microscopy (PINEM)

Energy gain/loss of electrons in the photon field around the object:

Pulse lengths:
laser: 370 fs, electrons: 3.5 ps

gauss2 Absorption and emission of IR photons with energy 1.2 eV (laser repetition frequency 500 kHz, UV laser power 8 µW)


Tradeoffs between temporal and energy resolution at different Wehnelt bias settings

details in K. Bücker et al., Ultramicroscopy, 171, 8 (2016)

dt-vs-deThe 3D plot shows the measured temporal and energy resolution at different bias settings for intense electron pulses.

A temporal resolution of approximately 1 ps can be achieved with weak electron pulses.



Performance in the single-pulse mode

to come soon



Applications in materials science

to come soon