Deposit of tin on silicon substrate

Deposit of tin on silicon substrate

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Credit: PHILIPPE PLAILLY/SCIENCE PHOTO LIBRARY

Caption: Scanning tunnelling micrograph of a deposit of tin on a silicon substrate. The scanning tunnelling microscope (STM) is capable of atomic scale resolution and uses a fine point electrode, a few atoms thick at the tip. This is brought to within a few angstroms ( a few ten-millionths of a millimetre) of the sample's surface. As the electron clouds of the tip and the sample atoms interact, a small 'tunnelling' current passes. The electrode scans across the surface, moving vertically to maintain the tunnelling current. This motion is then processed to produce a map such as that seen here. The sample size is 100x100 nanometres, the vertical scale is exaggerated.

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Keywords: chemical, chemistry, colour, coloured, deposit, element, elements, microscopy, scanning tunnelling micrograph, stm image, stm imagery, tin, tin deposit

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