L06S07_MatterWaves Nitsche 01-29-07

L06S07_MatterWaves Nitsche 01-29-07 - Chem 1A...

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Unformatted text preview: Chem 1A L6:"Matter Waves" 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, UC A.Pines,M.Kubinec,UCB L6-1 L7-6 Summary Particles and Waves Momentum Matter Particle Photon (yellow) (yellow) e- (v ~ 105 m sec-1) Na (80K, v~300 m sec-1) Baseball (170g, v~40 m sec-1) L6-4 A.Pines,M.Kubinec,UCB 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 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, UC + 2002 A.Pines,M.Kubinec, UC A.Pines,M.Kubinec,UCB L6-2 L8-7 Diffraction and Interference Intensity A+B Probability Distribution ~ ~ L6-3 2002 A.Pines,M.Kubinec, UC A.Pines,M.Kubinec,UCB 1 Chem 1A L6:"Matter Waves" Matter Particles and Waves Momentum : 2 e- p=mv p=mv Particle p= h h=6.62 x 10-34 Js ~ Probability v Wave Duality h = p L6-4 2002 A.Pines,M.Kubinec, UC 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, UC de Broglie (nm) ~ 600 ~6 ~ 0.06 ~ 6x10-26 L6-5 Electron Microscopy 2002 A.Pines,M.Kubinec, UC L6-6 A.Pines,M.Kubinec,UCB 2 Chem 1A L6:"Matter Waves" ChemQuiz 6.1 About how many photons are needed to ~stop the Na atom? 1) ~1 ~1 2002 A.Pines,M.Kubinec, UC 23Na h ~ 600 nm 80 K 2) ~102 ~10 3) ~104 ~10 L6-7 ChemQuiz 6.2 Electrons with ~ 4 nm are heated to x 4 their kinetic energy. What is energy. the new (nm)? eEkin=mv2 Ekin=p2/2m 1) ~ 1 2002 A.Pines,M.Kubinec, UC 2) ~ 2 3) ~ 8 L6-9 Discrete, Quantized States Standing Waves (x) E n 3 2 1 Nodes 2 1 0 L6-11 Excited States + + + - Ground State 2002 A.Pines,M.Kubinec, UC + A.Pines,M.Kubinec,UCB 3 Chem 1A L6:"Matter Waves" Absorption and Emission Spectra Electronic Transtions v E = h 2002 A.Pines,M.Kubinec, UC L6-12 ChemQuiz 6.3 Shown is an energy energy level scheme and the emission spectrum. Which line arises from 3 1? 3 2 1 A B C E 3) C L6-13 1) A 2002 A.Pines,M.Kubinec, UC 2) B ChemQuiz 6.4 To which energy-level energyscheme does the emission spectrum correspond? 1) 2002 A.Pines,M.Kubinec, UC 2) 3) L6-15 A.Pines,M.Kubinec,UCB 4 Chem 1A L6:"Matter Waves" Lecture Complete 2002 A.Pines,M.Kubinec, UC L6-17 A.Pines,M.Kubinec,UCB 5 ...
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