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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
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
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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