F/col STM image of silver film

F/col STM image of silver film

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Credit: PHILIPPE PLAILLY/SCIENCE PHOTO LIBRARY

Caption: False-colour scanning tunnelling microscope (STM) image of a silver film, revealing an apparent lack of any crystalline structure. The STM provides a detailed image of certain sample surfaces, allowing superficial atoms to be identified. The image is formed by moving a fine point just above the sample surface & electronically recording the height of the point as it scans. This is possible due to tunnelling, whereby an exchange of electrons occurs when the electron clouds surrounding superficial nuclei in the STM's point & sample surface overlap as they approach each other. STM studies to date (1990) have included DNA & bacteriophages.

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Keywords: chemical, chemistry, element, scanning tunnelling microscope, silver film, stm image, stm imagery

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