L05_MatterWaves

L05_MatterWaves - Matter Waves Diffraction and Interference...

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Unformatted text preview: Matter Waves Diffraction and Interference Intensity A+B ~ Probability Distribution 2006 A.Pines, M.Kubinec L5-2 Matter Particles and Waves Momentum : 2 ~ Probability v Wave h=6.62 x e- p=mv p=mv Particle p= h Duality 10-34 Js h = p L5-3 2006 A.Pines, M.Kubinec 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) 2006 A.Pines, M.Kubinec de Broglie (nm) ~ 600 ~6 ~ 0.06 ~ 6x10-26 L5-4 2006 M. Kubinec, A. Pines 1 Matter Waves ChemQuiz 5.1 About how many photons are needed to ~stop the Na atom? 1) ~1 ~1 2006 A.Pines, M.Kubinec 23Na h ~ 600 nm 80 K 2) ~102 ~10 3) ~104 ~10 L5-5 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 1) ~ 1 2006 A.Pines, M.Kubinec 2) ~ 2 3) ~ 8 L5-7 Discrete, Quantized States Standing Waves (x) E n 3 2 1 Nodes 2 1 0 L5-9 Excited States + + + + Ground State 2006 A.Pines, M.Kubinec 2006 M. Kubinec, A. Pines 2 Matter Waves Absorption and Emission Spectra Electronic Transtions v E = h 2006 A.Pines, M.Kubinec L5-10 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 3) C L5-11 1) A 2006 A.Pines, M.Kubinec 2) B ChemQuiz 5.4 To which energy-level energyscheme does the emission spectrum correspond? 1) 2006 A.Pines, M.Kubinec 2) 3) L5-13 2006 M. Kubinec, A. Pines 3 ...
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