Field-ion microscope
[feeld-ahy-uh n, -ahy-on] /ˈfildˌaɪ ən, -ˌaɪ ɒn/
noun
1.
a 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.
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