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welcome my name is Carrie Donnelly and Iamp;#39;m the director of The Chapel Hill analytical and Nano fabrication lab or Channel at UNC today Iamp;#39;m joined by Catherine McInnis a graduate student at UNC who will be showing you how to prepare samples for x-ray photoelectron spectroscopy or XPS hello Carrie the samples that weamp;#39;ll be analyzing are carbon films on Silicon substrates both the silicon and the carbon are conductive which is ideal for XPS in my research Iamp;#39;m trying to modify the top layer of carbon atoms by attaching different atoms like chlorine and sulfur to the surface and XPS is an ideal technique to determine if Iamp;#39;ve been successful my research is focused on trying to use these surfaces to produce hydrogen gas a renewable source of energy my samples are in the lab so letamp;#39;s go there now here are my XPS samples in the sample bar that I will attach them to because XPS is so surface sensitive I want to make sure that I donamp;#39;t touch