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L05S09_MatterWaves Nitsche 01-30-08

L05S09_MatterWaves Nitsche 01-30-08 - Chem 1A...

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Unformatted text preview: Chem 1A L5:"Matter Waves" Edited by Foxit Reader Copyright(C) by Foxit Software Company,2005-2008 For Evaluation Only. Electromagnetic Spectrum 400 Summary 500 600 Visible x-rays UV IR MW The Particle Nature of Light Light Intensity 700 nm -rays Radio, NMR, MRI 10-16 10-12 10-8 A.Pines,M.Kubinec,UCB 10-4 100 104 108 m L7-4 2002 A.Pines,M.Kubinec, UC Ephoton = h L8-6 Photoelectric Effect The Particle Nature of Light Light-Wave / Particle LightDuality Wave (length) I II e Ekin Particle (Momentum) c Wave h = p Duality p=mc Particle p= h Ephoton = h Ekin= h - = h - ho h L7-2 A.Pines,M.Kubinec,UCB 2002 A.Pines,M.Kubinec, UCB A.Pines,M.Kubinec,UCB L5-1 L7-6 Wave (length) Wave / Particle Duality (de Broglie relation) Particle (Momentum) Light c Wave h = p Duality h=6.62 x p Particle 10-34 Js p= h L5-4 2002 A.Pines,M.Kubinec, UCB Particles and Waves Summary Momentum Matter Particle Photon (yellow) (yellow) e(v ~ 105 m sec-1) DeBroglie (nm) ~ 600 ~6 ~ 0.06 ~ 6x10-26 L8-3 : 2 ~ Probability v 2 e- p=mv p=mv Particle h p= h=6.62 x 10-34 Js Wave Duality h = p L6-4 Na (80K, v~300 m sec-1) Baseball (170g, v~40 m sec-1) A.Pines,M.Kubinec,UCB 2002 A.Pines,M.Kubinec, UC Discrete, Quantized States Standing Waves (x) E n 3 2 1 Nodes 2 1 0 L6-11 Absorption and Emission Spectra E=h E=h Excited States + + + - Ground State + 2002 A.Pines,M.Kubinec, UCB 2002 A.Pines,M.Kubinec, UC A.Pines,M.Kubinec,UCB L5-5 L8-7 A.Pines,M.Kubinec,UCB 1 Chem 1A L5:"Matter Waves" Edited by Foxit Reader Copyright(C) by Foxit Software Company,2005-2008 For Evaluation Only. Diffraction and Interference one e- can form interference pattern, so it's a partical and a wave. Intensity A+B Probability Distribution ~ ~ L5-6 2002 A.Pines,M.Kubinec, UCB De Broglie Wavelengths Particle Photon (yellow) (yellow) e- (v ~ 105 m sec-1) Na (80K, v~300 m sec-1) Baseball (170g, v~40 m sec-1) 2002 A.Pines,M.Kubinec, UCB de Broglie (nm) ~ 600 ~6 ~ 0.06 ~ 6x10-26 L5-7 2 Electron Microscopy 2002 A.Pines,M.Kubinec, UCB L5-8 A.Pines,M.Kubinec,UCB 2 Chem 1A L5:"Matter Waves" ChemQuiz 5.1 About how many photons are needed to ~stop the Na atom? A) ~1 ~1 2002 A.Pines,M.Kubinec, UCB 23Na h ~ 600 nm 80 K B) ~102 ~10 C) ~104 ~10 L5-9 ChemQuiz 5.2 Electrons with ~ 4 nm are heated to x 4 their kinetic energy. What is energy. the new (nm)? eEkin=mv2 Ekin=p2/2m A) ~ 1 2002 A.Pines,M.Kubinec, UCB B) ~ 2 C) ~ 8 L5-11 Discrete, Quantized States Standing Waves (x) E n 3 2 1 Nodes 2 1 0 L5-13 Excited States + + + - Ground State 2002 A.Pines,M.Kubinec, UCB + A.Pines,M.Kubinec,UCB 3 Chem 1A L5:"Matter Waves" An electron as a standing wave around the nucleus 2002 A.Pines,M.Kubinec, UCB L5-14 Absorption and Emission Spectra Electronic Transtions v E = h 2002 A.Pines,M.Kubinec, UCB L5-15 ChemQuiz 5.3 Shown is an energy energy level scheme and the emission spectrum. Which line arises from 3 1? 3 2 1 A B C E C) C L5-16 A) A 2002 A.Pines,M.Kubinec, UCB B) B A.Pines,M.Kubinec,UCB 4 Chem 1A L5:"Matter Waves" ChemQuiz 5.4 To which energy-level energyscheme does the emission spectrum correspond? A) 2002 A.Pines,M.Kubinec, UCB B) C) L5-18 Lecture Complete 2002 A.Pines,M.Kubinec, UCB L5-20 A.Pines,M.Kubinec,UCB 5 ...
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