May 11, 2011
Transmission electron microscopes create magnified images of samples and are, in contrast to the light microscope, even able to resolve individual atoms. When transmitting a beam of electrons through a crystalline sample such as a complex mineral or a crystallized protein, the electrons are being diffracted in a specific way. Collecting such diffraction patterns of a sample from several different directions uniquely identifies a specific crystal structure.
The new QED software now can control almost any transmission electron microscope to automatically collect so called LARBED (Large-Angle Rocking-Beam Electron Diffraction) patterns. LARBED patterns are comprised of a series of diffraction patterns collected for a large range of directions of the electron beam. Although collected for a single specimen orientation such LARBED patterns provide 3-dimensional information and thus enable researchers to better extract information about the structure of crystalline materials in various fields of applications such as materials science, geology and life sciences.
LARBED is a patented procedure, which has been developed by Christoph Koch at the Max Planck Institute for Intelligent Systems (formerly Max Planck Institute for Metals Research) in Stuttgart, Germany. The advantage of LARBED is that it overcomes difficulties caused by multiple scattering of electrons passing through a sample. This dynamical scattering makes it, amongst other things, difficult to analyze the intensities of the diffracted beam when using other methods based on electron diffraction. This leads to the loss of valuable information.
The new software for automated acquisition of LARBED patterns works by controlling the tilt angle and position of a collimated electron beam. The QED software compensates the beam shift with the help of the illumination system of the microscope. Thus data about characteristics from nano-sized samples can be collected. LARBED data contain an enormous amount of information about examined specimen, including specimen thickness, the absolute values of structure factors, the crystal symmetry even of very thin (<10 nm) samples, as well as the specimen surface orientation.
About HREM Research Inc.
Founded in 2001, HREM Research Inc. specializes in developing products and services that enhance High-Resolution Electron Microscopy (HREM). Dr. Kazuo Ishizuka, the founder of a company has established the whole technique for HREM image simulation. Thus, a company's flagship product, xHREM, is a de facto standard of HR-(S)TEM image simulation software. Currently, HREM Research Inc. is actively working on making useful techniques to be available for the HREM community.
About Max Planck Innovation
Max Planck Innovation is responsible for the technology transfer of the Max Planck Society and, as such, the link between industry and basic research. With our interdisciplinary team we advise and support scientists in evaluating their inventions, filing patents and founding companies. We offer industry a unique access to the innovations of the Max Planck Institutes. Thus we perform an important task: the transfer of basic research results into products, which contribute to the economic and social progress.