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Particle Physics A Quick Tour Models of the Atom Thomson – Plum Pudding Why? Known that negative charges can be removed from atom. Problem: just a random guess – – – – – Rutherford – Solar System Why? Scattering showed hard core. Problem: electrons should spiral into nucleus in ~10-11 sec. + – Models of the Atom Bohr – fixed energy levels Why? Explains spectral lines. Problem: No reason for fixed energy levels deBroglie – electron standing waves + Why? Explains fixed energy levels Problem: still only works for Hydrogen. Schrodinger – will save the day!! + Einstein’s Nobel Prize 1905: Einstein explained the photoelectric effect, which earned him the Nobel Prize in 1921. Light is made of tiny packets of light, called photons. Atomic Structure The Smallest Atom: H Electron Photon Quarks Gluons Matter and Antimatter Bosons Pulling Quarks Apart Colliding Protons ATLAS Detector Baryons and Mesons