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okay so uh so my one of my main topics in my research career has been to study atomic or and molecular negative ions and i just thought with a few um two minutes here about setting why i think they are interesting so basically if you i mean henrik hartman this morning showed a typical energy level diagram of an atom and with all the ground state and all the excited states and to point out i mean then for an atom or a positive ion you always have a long range one over r potential if you form a negative ion think about h minus you take a neutral atom and you attach an electron which basically means that there is no long-range force and conceptually you can actually think about this as the part square well potential that is the first step in the quantum physics class and if you then go into the properties of this uh square well potential you know that there is a limited number of bound states and also the number of states depends on the depth and width and it out that is the binding energ