Fiber Identification – Getting Deeper than the Surface
X-ray photoelectron spectroscopy is a technique used to determine the chemical signature of the surface of whichever fabric is being tested. This is performed by zapping the test sample with a focused X-ray beam, knocking electrons off of the surface and into a detector to measure the kinetic energy possessed in the electrons. This technique, however, is not very effective on fabrics treated with chemicals. Using a tweaked method of this technique, Brian Strohmeier, a scientist at Thermo Fisher Scientific, a laboratory-instrument company based in Massachusetts, is able to get beyond the surface and past the chemical treatments. This opens the door to a more comprehensive analysis of the fabric and where it originated.
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[Abstract by Walter Tates, ForensIQ Inc. Intern, 040314]
