Operation of the Field Ion Microscope with Neon
作者:
Osamu Nishikawa,
E. W. Mu¨ller,
期刊:
Journal of Applied Physics
(AIP Available online 1964)
卷期:
Volume 35,
issue 10
页码: 2806-2812
ISSN:0021-8979
年代: 1964
DOI:10.1063/1.1713112
出版商: AIP
数据来源: AIP
摘要:
The image quality obtained with neon as an imaging gas was studied. Neon can give stable images of non‐refractory metals because its ionization field is lower than the evaporation field of these metals. Field evaporation occurs in helium and in neon at slightly lower fields than in vacuum when the incoming nonionized gas molecules which have both thermal and dipole attraction energy collide with the surface atoms. Localized field evaporation leads to dynamic end forms of the emitter tip which are characteristic for vacuum, neon, and helium. The ion image obtained with helium containing a few percent neon has a reduced contrast and shows more details around the low‐field areas. Field evaporation in this mixed gas produces surface vacancies inside closed net planes. These effects indicate that adsorbed neon atoms act as intermediate collision partners to allow a more efficient transfer of the energy from the light helium atom to the heavy metal atom.
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