I have a general question on particle acceleration and eV's. Apparently the amount of electron Volts required to ionize a hydrogen atom (that is, remove the electron from the proton), is 3.4 eV (When N = 2, the energy level is -13.6 eV / 2^2 = -3.4 eV). if initially the atom is in the state N = 2? (Remember that N = 1 if the atom is in the lowest energy level.. Source: https://answers.yahoo.com/question/index?qid=20080710121847AA33ZKz Once the proton is isolated I can fire it into a particle accelerator correct? And this 3.4eV is generally what is talked about for energy levels for large accelerators correct? Like the LHC can reach 7TeV. What particles then would require that much energy to be stripped? I'm confused exactly what the eV measurement means for particle accelerators. If I just wanted to create a proton, speed it up, and collide it with something what energy level would I be looking at? Just the 3.4eV roughly?