class39 - Todays class: Superposition States Measurements...

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Today’s class: • Superposition States • ‘Measurements’ Summary: 1D Schrödinger 2 2 ψ h Traveling waves Bound states (Eigenfunctions) Tunneling ) ( ) ( ) ( ) ( 2 2 x E x x V x x m = + Ψ (x,t)= (x) e -iEt/ħ Various kinds of scanning microscopes STM: Scanning tunneling microscope Sensing mode: electron tunneling (current) Pros: • Exponential z- dependence b highest resolution Cons: • Cannot zoom out (hard to find area of interest) • Sample needs to be conductive Sensing mode: electron scattering (elastic or inelastic) Pros: Can zoom out (6 orders SEM: Scanning electron microscope • Can zoom out (6 orders of magnitude) • Rapid scanning Cons: • Sample needs to be conductive and grounded to avoid static charge • Limited resolution (~nm) Can only measure conductive samples? No Problem!! Anything can be made conductive Anything can be made conductive! Even spiders±
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Sensing mode: Coulomb or ‘van der Waals’ force Pros: Works on any surface AFM: Atomic force microscope • Works on any surface Cons: • Limited resolution Sensing mode: Optical near field (light scattering) Pros: NSOM: Near-field Scanning
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This note was uploaded on 08/24/2010 for the course PHYS 2130 taught by Professor Staff during the Spring '08 term at Colorado.

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class39 - Todays class: Superposition States Measurements...

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