I'm supposed to be working with a CMA (Cylindrical Mirror Analyzer), but I'm more interested in the physics behind it. This is the instrument in question that we are looking to get: http://www.rbdinstruments.com/products/micro-cma.html We want it to look at different eV levels of different wavelengths and how it compares to the theoretical values we are looking to get. I know it works off of photoemission, but kind of confused how the readings work? I'm confused on how/why it works and there's nothing on Wikipedia that I can find on it to go off of. This is similar to the set up we are looking at: https://upload.wikimedia.org/wikipedia/commons/thumb/f/f7/AES_Setup2.JPG/340px-AES_Setup2.JPG Where the Ion source will be something like an electron gun, and the electron gun in the photo would be the microCMA. What makes this set up different from say a spectrometer, or using a CCD camera or something else of the sort? What's the advantage here that I'm not seeing?