Tuesday 11 April 2023
14:00 BST/09:00 Eastern Daylight Time/16:00 Israel Standard Time/10:00 Brazil
We are pleased to announce that Professor Archie Howie gave a lecture entitled "From Diffraction Contrast to HAADF and ALOOF Beam" at 14:00 BST/09:00 Eastern Daylight Time/16:00 Israel Standard Time/10:00 Brazil.
Registration to this lecture was free.
The International Microscopy Lecture Series is a collaborative undertaking by four International Microscopy Societies (the Royal Microscopical Society, the Microscopical Society of Canada and the Israel Society for Microscopy and the Brazilian Society of Microscopy and Microanalysis).
Ahead of this lecture was an interview between Professor Archie Howie and Professor Mick Brown.
Professor Archie Howie gave a lecture entitled "From Diffraction Contrast to HAADF and ALOOF Beam".
University of CambridgeArchie Howie is best known for his early joint contributions with Peter Hirsch and Mike Whelan to diffraction contrast imaging through the Howie Whelan equations and channelling effects. He also explained the surprising observation that inelastically scattered electrons could still show interference contrast. With the development of HREM and direct imaging methods he then tested the widely used 2-d projection approach in a critical but unsuccessful attempt to unravel the structure of amorphous materials. The students who took part in this struggle (Krivanek, Gibson and Rodenburg) nevertheless went on to do great things on their own. Following Crewe’s revolutionary work, Archie and Mick Brown were lucky to acquire one of the first VG STEMS. Thanks to the involvement of more brilliant students (e.g. Craven, Treacy and Pennycook) major new techniques such as HAADF imaging were pioneered. ALOOF beam electron spectroscopy, another STEM technique demonstrated by Marks, became a fertile topic for extended theoretical investigation by Archie with Rufus Ritchie, Pedro Echenique and colleagues in San Sebastian. Now that spatially localised electron spectroscopy has moved down to the optical and even infrared regions, this work has taken on new impetus.