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yjfeng2000

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[资源] nature materials 专刊 Electron and X-ray microscopy

Knowledge of the microscopic structure and composition of materials is essential for understanding their properties and designing functional devices. Microscopy techniques based on electrons and X-ray photons have been used to ‘look’ inside matter for decades. In the past few years, advances in instrumentation and sofware have led to unprecedented power, both in terms of spatial resolution and sensitivity to composition and physical properties. With the advent of aberration correction and increasing computational speeds, electron microscopes can now image single atoms buried within structures, and provide
information on chemical composition and bonding with atomic resolution. Electron tomography images structures in three-dimensions, and with electron
holography it is possible to map electric and magnetic potentials. Advances in optics and the implementation of high-brightness synchrotron radiation sources have led to the development of extremely sensitive X-ray techniques, able, for example, to image composition in organic devices and domain structure in magnetic materials, or strain in nanomaterials.
More exciting developments are just around the corner. With free-electron lasers, such as the one that will soon be operating at the Stanford Linear Accelerator Center, X-ray microscopy will eventually allow us to image
dynamics of molecules on the femtosecond timescale, with spatial resolution comparable to interatomic lengths. In addition, milestone achievements in electron microscopy, such as in situ atomic resolution and atomic resolution tomography, are likely to be achieved soon through the efforts of dedicated ventures, such as the TEAM (transmission electron aberration-corrected
microscope) project in the United States.
The collection of articles in this Insight aims to illustrate what, in our view, are the most outstanding capabilities of modern imaging techniques based on electrons and X-ray photons — usually treated separately — to our wide audience. It is, of course, still a small selection of topics in a broad research field — or rather two fields. We hope, however, that you will enjoy this
overview and that it will encourage you to keep up to date with current and future exciting developments.

Fabio Pulizzi, senior editor

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[ Last edited by yjfeng2000 on 2009-3-26 at 05:43 ]

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