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Electronics residues testing methods, part 2; This month's analysis: SEM and EDX.



Ed.: This continues a four-part series on typical analysis techniques and their pros and cons pros and cons
Noun, pl

the advantages and disadvantages of a situation [Latin pro for + con(tra) against]
 in regard to understanding electronics residues.

Energy dispersive dispersive /dis·per·sive/ (-per´siv)
1. tending to become dispersed.

2. promoting dispersion.
 x-ray spectroscopy (also known as EDS (Electronic Data Systems, Plano, TX, www.eds.com) Founded in 1962 by H. Ross Perot (independent candidate for the President of the U.S. in 1992), EDS is the largest outsourcing and data processing services organization in the country.  or EDX EDX Energy Dispersive X-Ray (Spectroscopy)
EDX Electronic Data Exchange
EDX Extended Data Register
EDX Event-Driven Executive (IBM Series/1 OS)
EDX Event-Based Data Exchange (UPNet) 
) is an analytical technique used for elemental analysis or chemical characterization. The elemental matter is hit with charged particles, and EDX analyzes the x-rays emitted. There are four primary components of the EDX setup: beam source, x-ray detector, pulse processor and analyzer. Most often, EDS is part of scanning electron microscope scan·ning electron microscope
n. Abbr. SEM
An electron microscope that forms a three-dimensional image on a cathode-ray tube by moving a beam of focused electrons across an object and reading both the electrons scattered by the object and
 or electron microprobe (Figure 1). A SEM comes with cathode and magnetic lenses to create and focus a beam of electrons. (It also has elemental analysis capabilities.) A detector converts x-ray energy into voltage signals; this information is sent to a pulse processor, which measures the signals and passes them on to an analyzer for data display and analysis. (1)

[ILLUSTRATION OMITTED]

[FIGURE 1 OMITTED]

Applications and limitations. The use of SEM identification of metal elements with only gross high levels of ionic elements. The EDX scan of this contact brush on a motor (Figure 2) shows carbon, oxygen, copper, silver, aluminum (part of the detector), silica, gold (sputter coating to protect and test sample), but it does not show the chloride and succinic acid from a water-soluble flux used to solder wires on the motor and let it flow into the motor.

[FIGURE 2 OMITTED]

The SEM/EDX SEM/EDX Scanning Electron Microscope/Energy Dispersive Using X-Ray (Analysis)  analysis shows elemental information, but quantification is difficult. Because EDX uses a single electron beam to release the elemental shell and bounces this shell to the detector, it will burn through a thin film of organic and ionic residues on the surface of whatever is cut up and placed into the vacuum chamber. Because SEM/EDX is a destructive test-requiring either cutting, coating or scraping-it must be the last test run on the area of investigation. Thin-film materials, such as chloride and sulfate, can be volatilized vol·a·til·ize  
intr. & tr.v. vol·a·til·ized, vol·a·til·iz·ing, vol·a·til·iz·es
1. To become or make volatile.

2. To evaporate or cause to evaporate.
 under sublimation where the thin materials will be carried away in the vacuum and not detected.

References

1. Wikipedia.

Terry Munson is with Foresite Inc. (residues.com); tm_foresite@residues.com. This column appears monthly.
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Title Annotation:Process Doctor
Comment:Electronics residues testing methods, part 2; This month's analysis: SEM and EDX.(Process Doctor)
Author:Munson, Terry
Publication:Circuits Assembly
Date:Dec 1, 2008
Words:352
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