Improvements in Mapping and Microanalysis by FEG-EPMA
نویسندگان
چکیده
منابع مشابه
Electron Probe Microanalysis (EPMA)
An electron microprobe is an electron microscope designed for the non-destructive x-ray microanalysis and imaging of solid materials. It is essentially a hybrid instrument combining the capabilities of both the scanning electron microscope (SEM) and an x-ray fluorescence spectrometer (XRF), with the added features of fine-spot focusing (~ 1 micrometer), optical microscope imaging, and precision...
متن کاملCompositional Mapping by EPMA and μXRF
We present methods combining backscattered-electron (BSE) mosaic imaging, quantitative spot-mode electron-probe microanalysis (EPMA), and quantitative compositional mapping by EPMA and micro-xray fluorescence (μXRF) to provide a framework for detailed analysis of terrestrial and lunar samples. BSE imaging provides a base map for the characterization of samples by EPMA. Recent developments in im...
متن کاملImportance of Carbon Contamination in High-Resolution (FEG) EPMA of Silicate Minerals.
The effect of carbon contamination on the analysis of carbon-coated silicate minerals at 5 kV for X-ray energies 0.7-4 keV is examined. For individual spot analyses, carbon is found to deposit adjacent to the beam spot forming ring-shaped deposits with no impact on the analysis. Carbon contamination becomes important for closely spaced analyses such as multipoint transects, where each subsequen...
متن کاملMitigating Thermal Beam Damage with Metallic Coats in Low Voltage FEG-EPMA of Geological Materials
Field emission gun electronprobe microanalysis (FEG-EPMA) provides the analyst with the opportunity to characterize very small volumes of material. Using a low voltage source the irradiated volume is submicron. It is well known that some geological phases e.g. volcanic glass, carbonates, phosphates, hydrous silicates suffer beam damage under high beam current condition [e.g.1,2] and several aut...
متن کاملFEG-EPMA of Solid State Redox Sensors – the Effect of Secondary Fluorescence on Analytical Precision
High-pressure oxygen fugacity (‘redox’) sensors are widely used to make estimates of the effective concentration of oxygen in experimental petrology. They typically rely on iron either diffusing into a nominally iron free mineral (e.g. iron into magnesiowüstite [1]) or iron alloying with a noble metal[2, 3]. In both cases the iron content of the sensor material should reflect the prevailing oxy...
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ژورنال
عنوان ژورنال: Microscopy and Microanalysis
سال: 2006
ISSN: 1431-9276,1435-8115
DOI: 10.1017/s1431927606063124