lecture3 - Chem 120a 01/22/07 Spring 07 Quantum...

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Chem 120a Quantum Particles/Waves 01/22/07 Spring 07 Lecture 4 Reading: Feynman Chapter 1 and 3.1, 3.2 Last time (recall Lecture 3), talked about classical particles and classical waves. Today, focus on quantum particles/waves (i.e. electrons, molecules, atoms, etc.) In above experiment, detector detects individual electrons Æ discrete clicks for each electron arriving. P(y) = probability of electron arriving at point y = N N(y) lim N →∞ where N(y) is number of clicks/counts/electrons at point y and N is the total number of counts Again do 3 experiments: (1) Close off slit 2 Æ get P 2 as shown in figure (2) Close off slit 1 Æ get P 1 as shown in figure same results as with classical particles BUT! (3) Have both slits open (i.e. TWO pathways for electron to get to detector) Æ get P 12 as shown in figure see INTERFERENCE pattern! P 12 (y) P 1 (y) + P 2 (y) Probability distribution of quantum particles/waves (i.e. electrons) behaves like intensity of wave, suggesting the existence of PROBABILITY AMPLITUDE.
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lecture3 - Chem 120a 01/22/07 Spring 07 Quantum...

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