STM image of gold film

STM image of gold film

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Caption: False-colour scanning tunnelling microscope (STM) image of a gold film, epitaxially deposited on a mica substrate. The STM provides a detailed image of the surfaces of certain samples, 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. STM studies to date (1990) include DNA, bacteriophages & many inorganic molecules.

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Keywords: chemical, chemistry, colour, coloured, element, elements, epitaxially-grown, epitaxy, gold film, microscopy, scanning tunnelling microscop, stm image, stm imagery

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