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set1 - CH354L Instructor:RonElber [email protected]

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CH354L: Instructor : Ron Elber [email protected] hours: M/W 9:00‐10:00 Elements of atomic structure, chemical bonding, spectroscopy, and kineKcs
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Duality of parKcle and waves parKcles waves
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Are electrons parKcles? Cathode ray deflecKon experiment by J.J. Thomson Charged parKcles can be deflected by electric or magneKc felds ElectromagneKc waves (like light) cannot! ‐> electrons are parKcles!
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Experiment to determine the raKo q/m for a charged parKcle ½ m v 2 E H L ½ m (v 2 + u 2 ) v – entrance velocity m– parKcle mass H – magneKc Feld E – electric Feld L – length travel by charge along v q – parKcle charge Θ – deflecKon angle t – travel Kme u–velocity component perpendicular to v. Induced by electric Feld. θ Measure θ as a funcKon of E and H
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Determine q/m raKo for electron Apply magneKc Feld H to avoid deflecKon of electron beam with velocity v in electric Feld E . The force F from electric Feld ( F(E) ) and magneKc Feld F(H) must be equal. F(E)=qE F(H)=qvH . Note that the magneKc force depends on the velocity. Hence, we can determine the
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set1 - CH354L Instructor:RonElber [email protected]

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