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PHY122_L23 - PHY122 Physics for the Life Sciences II...

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PHY122 – Physics for the Life Sciences II Lecture 23 Atomic and Molecular Physics Note: Clicker Channel 21 11/29/2011 Lecture 23 1
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Summary Quantum Physics Photons: light QUANTA with energy E=hf=hc / λ , with hc= 1240 eV·nm proof: from the Photoelectric Effect (sub)Atomic particles exhibit wave character : – momentum wavelength: p=h / λ the particle system has an associated wave function ψ (r) wave function squared | ψ (r)| 2 describes the probability for finding a particle at position r . consequences: mono-energetic light ánd particle beams both exhibit INTERFERENCE and diffraction … Thus: when CONFINED (e.g. in box of length L ), the system shows DISCRETE energy/momentum levels e.g. for particle in a box: E n =n 2 h 2 /(8 mL 2 ) transitions between energy states via emission and absorption of photons of energy equal to the energy level difference going from the quantum to the classical regime: n large 11/29/2011 Lecture 23 2
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