Kalendarz wydarzeń

Seminarium Fizyki Ciała Stałego i Seminarium ACMiN: "Electron Diffraction in the Scanning Electron Microscope: An Atom's Perspective."
Środa, 14. Listopad 2018, 09:00 - 11:00

Uprzejmie zapraszamy na Środowiskowe Seminarium Fizyki Ciała Stałego i Seminarium ACMiN, które odbędzie się w środę 14 listopada 2018 r. o godz. 9.00 w Sali Audytoryjnej ACMiN AGH na II piętrze budynku D-16 (ul. Kawiory 30).

Referat pod tytułem "Electron Diffraction in the Scanning Electron Microscope: An Atom's Perspective." wygłosi Dr. Habil. Aimo Winkelmann (Laser Zentrum Hannover, Niemcy).

Streszczenie:

The Scanning Electron Microscope (SEM) is a powerful tool to investigate a wide variety of samples on length scales ranging from centimetres down to the nanometer region. The polycrystalline microstructure of many technological, geological, and even biological materials calls for suitable microcrystallographic analysis methods in the SEM. Application examples include steels, metal alloys and semiconductors, but also meteorites, chiral quartz crystals, and egg-shells of dinosaurs and birds. In this talk, the two main sources of crystallographic information in the SEM will be discussed: Diffraction effects of electrons in the primary SEM beam lead to the formation of the "electron channelling patterns" (ECP), while diffraction of inelastically backscattered electrons is used in the method of "electron backscatter diffraction" (EBSD). In both methods, very characteristic diffraction patterns play a central role, the so-called "Kikuchi patterns". By adopting the perspective of an atom in a crystal, the beautiful geometry and the instructive physics of Kikuchi pattern formation will be explained and a selection of possible applications will be discussed.

Miejsce : Sala Audytoryjna ACMiN AGH (1.02A), na II piętrze pawilonu D-16 (ul. Kawiory 30)