electron probe microanalysis


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Related to electron probe microanalysis: EPMA

electron probe microanalysis

n
(General Physics) a technique for the analysis of a very small amount of material by bombarding it with a narrow beam of electrons and examining the resulting X-ray emission spectrum
References in periodicals archive ?
In order to investigate the composition of vegetative analogs of pharmaceutical gelatin, the analyzing station JEOL JED-2300 was used for electron probe microanalysis on order to obtain spectrometric profiles that make it possible to determine the chemical composition of vegetative analogs for pharmaceutical gelatin.
Table 1 Location, collection date, standard length range (mm), and sample sizes (n) of larval and juvenile walleye pollock (Theragra chalcogramma) captured from the southeast Bering Sea (SE Bering), North Bering Sea (N Bering), Bristol Bay, Shelikof Strait, Prince William Sound (PWS), and Yakutat, and analyzed by laser ablation ICP-MS (ICP-MS) and electron probe microanalysis (EPMA).
Having set a foothold as a national and international leader in the development of the field of electron probe microanalysis, Kurt was lured in 1964 to the then National Bureau of Standards (NBS) in Washington, DC, to continue working in XRF and EPMA in the Spectroanalysis Section.
Having immigrated to the USA in 1957, he worked for 8 years at DuPont de Nemours, in the analysis of alloys and oxides by x-ray fluorescence and electron probe microanalysis. He then joined the Spectroanalysis Section of the National Bureau of Standards (now NIST), doing research in the theory and applications of electron and ion probe microanalysis.
Myklebust, "Standardless" quantitative electron probe microanalysis with energy-dispersive X-ray spectrometry: is it worth the risk?, Anal.
Quantitative analyses of specimens by atomic absorption spectroscopy (at Manchester University) and by electron probe microanalysis (on behalf of Cleveland Potash Ltd.) have shown [Fe.sup.2+] to be substituting for Mg at levels up to about 30 mol%.
Key words: electron probe microanalysis; EPMA; gas flow proportional detector; GFPC; pulse pile-up rejection; sealed proportional counter; x ray; XePC; x-ray detectors.
Remond, Electron probe microanalysis of oxygen in strongly insulating oxides, Microbeam Anal.
The early development of quantitative electron probe microanalysis, first using crystal spectrometers, then energy dispersive x-ray spectrometers (EDXS), demonstrated that elements could be detected at 0.001 mass fraction level and major concentrations measured within 2 % relative uncertainty.
Calculations of average backscatter (or electron loss) for compounds in electron probe microanalysis (EPMA) have traditionally utilized mass fraction averaging (1).
In conventional electron probe microanalysis the accelerating voltage is generally in the range of 15 kV to 25 kV, which provides the necessary overvoltage and sufficient current from the thermionic source to excite efficiently the K and L x-ray lines for elements with atomic numbers as high as Z = 83.
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