Lecture16_AP3 - 1 Transitions and Atomic Spectra Scattering...

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2 Transitions and Atomic Spectra Scattering The Laser Summary
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3 Transitions between different energy levels determine the spectra of atoms (and molecules). But not all transitions are equally likely: Allowed transitions Satisfy the selection rule Δ l = ±1 Lifetime of excited states ~ 1 ns Forbidden transitions Not strictly impossible…just highly improbable Lifetime of excited states >> 1 ns
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4 Rayleigh scattering An incident photon scatters elastically off atomic (or molecular) electron 3 2 1 0
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5 http://en.wikipedia.org/wiki/Rayleigh_scattering The probability of scattering goes like so blue light is scattered more strongly than red light
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6 Compton scattering The energy of an x-ray or gamma-ray can be high enough to dislodge an electron from an atom or molecule 3 2 1 0
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7 Raman scattering An incident photon scatters inelastically off an electron in the ground state E f = hf i Δ E 01 3 2 1 0 E i = hf i
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8 Raman scattering 3 2 1 0 An incident photon scatters inelastically off an electron in an excited state E i = hf i E f = hf i + Δ E 01
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