Berlin 2012 – wissenschaftliches Programm
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MI: Fachverband Mikrosonden
MI 4: 100 years since the Laue experiment: Topical aspects of diffraction and scattering (Joint Session KR, BP, DF, GP, MA, MI, MM; related to SYXD)
MI 4.1: Hauptvortrag
Dienstag, 27. März 2012, 09:30–10:00, EMH 225
The discovery of X-ray interferences, the role of characteristic radiation therein and potential applications of the Laue method in modern engineering. — •Hans-Jürgen Ullrich1, Siegfried Däbritz2, Enrico Langer2, Jürgen Bauch1, Andreas Danilewsky3, and Peter Paufler4 — 1Institute of Materials Science at the TU Dresden — 2Institute for Solid State Physics at the TU Dresden — 3Institute of Crystallography at the University of Freiberg — 4Institute of Structural Physics at the TU Dresden
It was during a noteworthy conversation between Paul Peter Ewald and Max von Laue in the English Garden in Munich in early 1912 that the foundation for the discovery of X-ray interferences was laid. They were debating which effects can be expected when short-wave electromagnetic radiation is allowed to impinge on crystals, and in a eureka moment Max von Laue theorized that interference phenomena are caused.
The first diffraction experiments were founded on the notion that the interferences in question might be characteristic radiation. The effect subsequently searched for was eventually discovered by Walther Kossel and his colleagues in 1934 (interferences from lattice sources, Kossel interferences). It is with this fact in mind that our lecture will look at the significance of Laue and Kossel diffraction patterns during the initial research into X-ray physics and their influence on all further academic work in this area. In the past, Laue’s discovery was mainly applied within the natural sciences, but more recently the Laue method has also been employed successfully in engineering, for example:
• for quality assessment procedures used within the framework
• of semiconductor chip production
• as diagnostic techniques for gas turbine blades.