Laboratoire Aimé Cotton and Laboratoire de Physique des Solides, Université Paris-Sud

The present lecture intends to demonstrate how the coupling of the narrow electron probe in a scanning transmission electron microscope with an efficient parallel electron energy loss spectroscopy system is quite well suited to the exploration of the local structural, chemical and electronic properties of nanostructures and interfaces. Major technical improvements have opened the field of spectrum imaging and chrono-spectroscopy. As a consequence, spatially resolved analysis at the subnanometer level has become currently accessible. Furthermore the high rate of spectrum acquisition (up to 100 Hz) is a prerequisite for performing dynamic studies.

These possibilities have been used, up to the limits of single atom identification and of the analysis of the electron states in single atomic layers, for addressing several situations encountered in nanotubular objects, nanoparticles and interfaces. Relying on the recently acquired results, routes have been identified for developing and realising the next generation of analytical transmission electron microscopes dedicated to studies in nanophysics.

Einladender: Prof. Dr. Helmut Kohl

Ort: Wilhelm-Klemm-Str. 10, IG I, HS 2

Zeit: Mittwoch, 28. November 2001, 17 Uhr c.t.

Kolloquiums-Kaffee ab 16.45 Uhr vor dem Hörsaal

Im Auftrag der Hochschullehrer des Fachbereichs Physik

Prof. Dr. T. Kuhn