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Describe how photon and/or electron collisions produce the following. a) Photon excitation b) Photon ionisation c) Electron-electron collision excitation d) Electron-electron collision ionisation You may find using this energy level diagram of electrons in an atom helpful in supporting your description. ionisation 14 n=0o 0.00eV 5.4 n=5 0.54eV n=4 -0.85eV n=3 -1.5ev n=2 -3.4eV n=1 -13.6ev