Qualitative and quantitative analysis
In the electron microprobe the characteristic X-rays are used to determine the qualitative and quantitative chemical composition of a sample. An energy-dispersive X-ray detector (EDX) as well as several wavelength-dispersive spectrometers (WDS) are used for this purpose. Our lab equipment allows for analysing many elements starting with Beryllium (Z=4 and heavier) with high spatial resolution. Quantification of the measurement results requires the use of suitable reference materials. Our lab holds available a large set of such standards.
Element distribution mapping
Besides punctual analyses, also the spatial distribution of elements an a sample can be visualised (along a line or for an area). The electron beam will either be scanned over the sample or the sample stage will be moved under a static beam. The X-ray intensities recorded by EDX and WDS systems are then used to display a map of the element concentrations. This is particularly useful for zoned minerals, in which the concentration gradients of certain elements can then be visualised.
Scanning electron microscopy
To help finding the spots of interest on your sample, both microprobes are equipped with an optical unit, which offers the possibility of using transmitted and reflected light microscopy. Furthermore, for visualization purposes the following detectors are installed: a secondary electron detector, a backscattered-electron detector and a cathodoluminescence detector.
