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PHOTON EMISSION??? As in the photo electric effect. OR Resonance??? Every element has a particular frequency so if you use say Hydrogen lamp, as measure it's photon emission spectrum. you will find the photons given off are of a certain wavelegnth. The electron orbiting the photon of the H atom has a principle quantum number, n,. Only discrete energy levels or orbitals are given and so the spectrum produced will have discrete spectral lines. This is because wavelegnth and therefore frequency is specific to a certain element. If you are thinking of mass spectrometry, then you could say certain isotopes have certain relative masses. Photons are emitted due to the electron in its energy level is excited and therefore jumps up energy level and when it comes back down it releases a photon of a given energy. This energy is the difference between the two energy levels in which the elecron jumped. If the orbital recieves enough excitement to allow it to jump to the highest energy level the it becomes ionised and no photon is emmited. The possible energy levels are not continuous and so when you say it is possible to use lower frequencies to emit photons or whatever then I dispute this. The mass of an electron is very small. The allowed energies can be found; E = (me^4/8E0^2h^2) 1/n^2 where m is the mass of an electron, e is the charge of an elecron, E0 is epsie nought, h is planks constant and n is the principle quantum number. The mass of the electron is so small that it can be said to be negligable and therefore energy might possibly exist regardless of mass. The Photo electric effect; This is used to prove light is of wave and particle in that bombarding metal with photons allows the release of an electron. Also electron diffraction can be used.
"Shengising Nugget"
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