Scanning tunnelling microscope. Scanning electron micrograph of a scanning tunnelling microscope (STM). The micromechanical STM is comprised of a needle electrode (at upper centre) on a suspended structure surrounded by motors. This STM can read data written as atomic-scale mounds or holes on a silicon chip. It works by bringing the needle to within a few ten millionths of a millimetre of the sample's surface. Electrons in the sample and tip interact and create a small tunnelling current. The needle is scanned across the sample,vertical movements maintaining tip-to-surface distance. These movements are processed to give a map of the surface. Magnification: x240 at 6x7cm size. Magnification: x365 at10x12cm size | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Scharf, David |
Taille de l’image : | 4096 px × 3071 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
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