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F/col STM image of acid bi-layer

F/col STM image of acid bi-layer

A150/0116

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Credit

PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY

Caption

False-colour scanning tunnelling microscope (STM) image of an unidentified acid bi-layer deposited on a substrate. A STM provides an image of sample surfaces, allowing superficial atoms to be identified. Basically, 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. Subjects studied with the STM to date (1990) include DNA, bacteriophages & numerous organic & inorganic molecules.

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Model release not required. Property release not required.

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