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An '''atomic microscope''' or '''scanning tunneling microscope''' is, [http://en.wikipedia.org/wiki/Scanning_tunneling_microscope according to Wikipedia], a powerful instrument for imaging surfaces at the atomic level. The STM can be used not only in ultra high vacuum but also in air, water, and various other liquid or gas ambients, and at temperatures ranging from near zero kelvin to a few hundred degrees Celsius. The STM is based on the concept of quantum tunneling. When a conducting tip is brought very near to the surface to be examined, a bias (voltage difference) applied between the two can allow electrons to tunnel through the vacuum between them. The resulting tunneling current is a function of tip position, applied voltage, and the local density of states of the sample. Information is acquired by monitoring the current as the tip's position scans across the surface, and is usually displayed in image form.
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An '''atomic microscope''' or '''scanning tunneling microscope''' is, [http://en.wikipedia.org/wiki/Scanning_tunneling_microscope according to Wikipedia], is a powerful instrument for imaging surfaces at the atomic level. The STM can be used not only in ultra high vacuum but also in air, water, and various other liquid or gas ambients, and at temperatures ranging from near zero kelvin to a few hundred degrees Celsius. The STM is based on the concept of quantum tunneling. When a conducting tip is brought very near to the surface to be examined, a bias (voltage difference) applied between the two can allow electrons to tunnel through the vacuum between them. The resulting tunneling current is a function of tip position, applied voltage, and the local density of states of the sample. Information is acquired by monitoring the current as the tip's position scans across the surface, and is usually displayed in image form.
  
 
Basic parts needed for an STM include:
 
Basic parts needed for an STM include:

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