Matthieu Picher

TL;DR: Based on the characterization of the electron pulses, the optimal conditions for the operation of ultrafast TEMs with thermionic gun assembly are elaborated and it is shown that the Wehnelt bias has a decisive influence on the temporal and energy spread of the picosecond electron pulses.

TL;DR: Insight is obtained in nickel oxide reduction, using single-shot electron pulses in an electron microscope with nanosecond resolution, and it is shown that the reaction kinetics in the reduction of nanocrystalline NiO differ from those in bulk materials.

TL;DR: A parametric study with single electron pulses having a 7 ns duration to find the optimal conditions for imaging, diffraction, and electron energy-loss spectroscopy (EELS) in the single-shot approach is implemented and the first EEL spectra taken with nanosecond electron pulses are shown.

TL;DR: In this paper, the length changes of individual switchable nanoparticles induced thermally by nanosecond laser pulses are compared with time-resolved optical measurements performed on an assembly of these particles.

TL;DR: In this paper, it is shown that graphitic shells encapsulating metal nanoparticles facilitate amorphization of metals and stabilize the amorphous phase against recrystallization, and that the encapsulation by a graphitic shell can be a route towards the stabilization of otherwise unfavorable amorphou metal or metal-carbon phases.