“field-ionization microscope”的概念、定义、习题解题方法及翻译-物理辞典

单词	field-ionization microscope
释义	field-ionization microscope(field-ion microscope; FIM) A type of electron microscope that is similar in principle to the field-emission microscope, except that a high positive voltage is applied to the metal tip, which is surrounded by low-pressure gas (usually helium) rather than a vacuum. The image is formed in this case by field ionization : ionization at the surface of an unheated solid as a result of a strong electric field creating positive ions by electron transfer from surrounding atoms or molecules. The image is formed by ions striking the fluorescent screen. Individual atoms on the surface of the tip can be resolved and, in certain cases, adsorbed atoms may be detected
随便看	permanent gas permanent magnet permeability permittivity permutations and combinations perpetual motion personal computer perturbation perturbation theory perversion PET peta- pewter Pfund series pH pH scale phase phase angle phase diagram phase modulation phase rule phase space phase speed phase transition phase-contrast microscope

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