This paper introduces the principles of fieldion emission at first, and then explains the construction and work principles of FID.
本文先介绍场离子发射的原理，然后介绍FID的结构及工作原理。
2
The fieldion image of tungsten with resolution of atomic level has been obtained and the surface structure of tungsten has been analysed.
取得具有原子级分辨的场离子像，并对钨场离子像反映的晶体表面结构进行了分析。
3
Seen here on June 13th from southern New Mexico, this Comet McNaught's long ion tail sweeps across the telescopic field of view (a negative image is inset).