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hello Iamp;#39;m Carrie Donnelly and Iamp;#39;m the director of The Chapel Hill analytical and Nano fabrication laboratory or Channel at UNC with me today is Catherine McInnis who will be showing you how to take X-ray photoelectron spectroscopy or XPS data thank you Carrie as a reminder this is a schematic of the XPS chamber in XPS we will hit the sample with x-rays that have enough energy to knock electrons out those electrons will be collected by the electron energy analyzer and detected the spectrum that is produced will tell us what elements are present on the surface of the sample Iamp;#39;m trying to bind chlorine and sulfur to the surface of a carbon film with a chemical reaction shown here letamp;#39;s go to the lab to see if I was successful this is the XPS chamber itamp;#39;s a large vacuum chamber thatamp;#39;s held at pressures in the 10 to the negative 9 Torah range let me point out the important parts of the chamber to you before we get started this is an aluminum x