| 单词 | field-ion microscope |
| 释义 | field-ion microscope[ feeld-ahy-uhn, -ahy-on ] / ˈfildˌaɪ ən, -ˌaɪ ɒn / nouna device in which the atomic structure of the surface of a conductor is made visible by introducing helium gas into the device and applying a high voltage to ionize and accelerate the gas toward a fluorescent screen. Also called ion microscope . Compare field-emission microscope. Origin of field-ion microscopeFirst recorded in 1950–55 Words nearby field-ion microscopefield house, field independence, Fielding, fielding average, Fielding, Henry, field-ion microscope, field jacket, field lark, field larkspur, field layer, field lens Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Scientific definitions for field-ion microscopefield ion microscope A microscope that produces an image of a sample of molecules, or even individual atoms, on the surface of a metal tip. Gas atoms absorbed in the tip are positively ionized by an electric field, and the tip is given a strong positive electric charge, causing the ions to be repelled and thus fly away from the tip. The pattern that the ions form on a collecting surface provides an image of the sample on the tip. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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