Abstract
With the aid of an x‐ray spectrometer attachment for the electron microscope (Elmiskop I), it is possible to perform quantitative analyses of the chemical elements in a specimen. The spectrometer attachment is based on the semifocusing method. It is equipped with six analyzing crystals and two counters which may be exchanged during operation. It is possible to analyze for all elements with an atomic number greater than 11. The minimum mass detectable is 10−14 g.

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