| 单词 | scanning tunneling microscope |
| 释义 | scanning tunneling microscopenouna device that uses a moving needle and the tunnel effect to generate a maplike image of the atomic surface structure of matter, thereby achieving even greater magnification than the scanning electron microscope. Words nearby scanning tunneling microscopescanning disk, scanning electron microscope, scanning force microscope, scanning line, scanning probe microscope, scanning tunneling microscope, scansion, scansorial, scant, scantling, scantlings Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Scientific definitions for scanning tunneling microscopescanning tunneling microscope A microscope used to make images of individual atoms on the surface of a metal. The microscope has a probe with a small voltage applied to it ending in a tiny sharp tip (ideally consisting of one atom) that is moved close the material's surface. Quantum tunneling of electrons between tip and the metal provides a small current, and that current is held constant by varying the distance between the tip and the material's surface atoms. As the probe is moved across the surface, a three-dimension image of the surface is formed, based on the continual adjustments made to the height of the tip to keep the electron flow constant. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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