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| Microscopy and Microanalysis » Instrumentation » APFIM | ||
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Atom probe field ion microscopy (APFIM) The analysed volume is cone shaped, typically with a diameter of 2-15 nm and a length up to several hundred nanometres. The 3-dimensional atom probe (3DAP) has a position sensitive detector, which gives the possibility of reconstructing the analysed volume in three dimensions, with special software. In the 1-dimensional atom probe (1DAP), the diameter is only a few nanometres and the chemical identity is only determined in one dimension (depth profile). By introducing noble gas (Ne, He) into the chamber of analysis, field ion microscopy can be conducted. When the DC voltage is applied to the specimen, the gas atoms are ionized at the specimen surface. The ionized atoms are projected radially to a screen where the field ion image is formed. This technique has a magnification in the order of one million times and the images have an atomic resolution We have two APFIMs: 1DAP 3DAP |
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