Microprobe imaging

With a special optical system at the sample chamber, combined with an imagir system at the detector end, it is possible to construct two-dimensional images of the sample displayed in the emission of a selected Raman line. By imaging from their characteristic Raman lines, it is possible to map individual phases in the multiphase sample however, Raman images, unlike SEM and electron microprobe images, have not proved sufficiently useful to justify the substantial cost of imaging optical systems. 

Fig. 5.8 Electron microprobe imaging of a commercial FCC catalyst with a V-trap additive...

Paunesku T, Vogt S, Maser J, Lai B, Woloschak G. X-ray fluorescence microprobe imaging in biology and medicine. J. Cell. Biochem. 2006 99 1489-1502. 

Figure 17. Wavelength-dispersive electron microprobe image of arsenic concentration in within a coal sample from the Black Warrior basin of Alabama. Brighter colors show areas with higher arsenic concentrations and reveal the oscillatory zonation of arsenic in pyrite. Black is coal. White arrows indicate cell lumens in the host coal that are filled with epigenetic pyrite. The labeled points are microprobe analysis sites (values in weight percent) HSI=4.38%As, HS2=4.45%As, HS3=3.97% A.s, CSI=0.40%As, CS2=0.33%As.

Figure 18. Wavelength-dispersive electron microprobe image of a cluster of pyrite framboids within coal from the Black Warrior basin Alabama. Bright colored areas show the presence of arsenic, nickel, and sulfur. Arsenic is concentrated in epigenetic overgrowths and cement surrounding the framboids, while the diagenetic framboid interiors them.selves contain little or no arsenic. This indicates that the arsenic was added after earliest diagenesis.

J Barbillat, P Dhamelincourt, M Delhaye, E Da Silva. Raman confocal microprobing, imaging and fibre-optic remote sensing A further step in molecular analysis. J Raman Spectrosc 25 3-11, 1994. NQ Dao, M Jouan. The Raman laser fiber optics (RLFO) method and its applications. Sensors Actuators B Chem 11 147-160, 1993. 

Microprobe imaging Multiple ion monitoring Microwave-induced plasma... 

Figure 10.15 (A) Epifluorescence image of human AD tissue stained with thioflavin S. (B) SXRF microprobe spectra from a thioflavin positive area and a thioflavin-negative area. SXRF microprobe images of (C) Ca, (D) Fe, (E) Cu, and (F) Zn content in the same tissue. In the Fe image, several pixels were excluded from the analysis due to Fe contamination in the A1 substrate. For all images, scale bar is 100 pm. 2005 Elsevier Inc.

Fig. 1 Cross-sectional electron microprobe images of four locations of a membrane electrode assembly (MEA) from a polymer-electrolyte fuel cell (PEFC) stack that was subjected to 1,994 uncontrolled start/stop cycles. The stack utilized two fuel passes, as shown. As expected by the reverse-current mechanism, the amount of damage depends on the distance from the fuel inlet. Note the changes in the cathode catalyst layer and the presence of platinum in the membrane, especially in the second pass...

Figure 6.23. X-ray photoelectron spectroscopy microprobe images of contamination on a polyester sheet. (A) A secondary electron image 20/xm x-ray beams on the indicated area gave (B) the survey electron spectrum and (E) the high resolution carbon spectra. These show the presence of fluorine in the contaminant and by the presence of CF2 that it is a fluorocarbon. The maps of (D) carbon and (C) fluorine confirm this and also show that the other smaller contaminants seen in the secondary electron image are not of the same material. (See color insert.) (From PHI [367] reproduced with permission.)...

Microprobe image patterns (Figs. 11 and 12) were taken on an ARL... 

The localization of structural features in the electron probe is aided by scanning techniques " that produce electron microprobe images of small sectors of the sample surface. It is also possible to obtain scanning images of element distribution. The most attractive feature of electron probe microanalysis is the fact that a quantitative analysis is possible, with errors of less than 3 % relative in most cases. Data evaluation requires the use of a computer, but the... 

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