School of GeoSciences

Instrument Specification

The Facility operates a fully automated electron probe microanalyser:

EPMA

Our CAMECA SX100 is equipped with five vertical crystal spectrometers and a PGT Spirit energy dispersive analyser. Samples can be observed via back-scattered and secondary electron imagery and in reflected and transmitted light. The optical microscope has magnifications between x100 and x900. The instrument operates under Windows, using Cameca's PeakSight software. Specialised software functionalities include quantitative X-ray mapping for quantitative elemental spatial distribution, quantitative line profiles for detailed compositional variation along user-defined lines, dynamic beam tracking for improved sample positioning (enabling automated analysis of very small areas or grains), and quantitative analysis of thin layers.

Diffracting crystals of six types enable analysis of elements between boron and uranium. The configuration of these within the five WD spectrometers permits analysis of almost any element combination. The large analysing crystals (LTAP, LPET and LLIF) enable higher analytical precisions, lower detection limits and faster analysis times. They enable, for example, analysis of glasses at high spatial resolution without Na mobilisation (LTAP), trace element analysis down to tens or hundreds of ppm, and high-quality analysis of beam-sensitive minerals such as carbonates and phyllosilicates.

 

Spectrometer 1 PET, TAP, PC0 PC2    
Spectrometer 2 LPET, LLIF    
Spectrometer 3 LPET, LLIF    
Spectrometer 4 LIF, PET, TAP, PC1    
Spectrometer 5 LTAP, LPET