|Jun10-12, 07:44 AM||#1|
EDX vs. XPS
Can someone help explain the difference between EDX(Energy-dispersive X-ray spectroscopy) vs. (XPS) X-ray photoelectron spectroscopy? Which is used for what application? Advantages/Disadvantages of each?
From what I have been reading from documentation, they seem to be the same.
|Jun10-12, 08:14 AM||#2|
EDX/EDS measures X-rays emitted from a sample, while XPS measures photoelectrons emitted from a sample. They are somewhat related.
"Energy-dispersive X-ray spectroscopy (EDS or EDX) is an analytical technique used for the elemental analysis or chemical characterization of a sample." "To stimulate the emission of characteristic X-rays from a specimen, a high-energy beam of charged particles such as electrons or protons (see PIXE), or a beam of X-rays, is focused into the sample being studied." The process relies on the uniquness of characteristic X-rays of each element.
X-ray photoelectron spectroscopy measures the characteristic photoelectrons emitted from a material. XPS spectra are obtained by irradiating a material with a beam of X-rays while simultaneously measuring the kinetic energy and number of electrons that escape from the top 1 to 10 nm of the material being analyzed. XPS requires ultra-high vacuum (UHV) conditions.