User:Jared A. Booth/Notebook/Physics 307L/2009/10/12: Difference between revisions
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==Theory== | ==Theory== | ||
In 1924, Lois de Broglie proposed that as photons can be seen as both waves and particles, so too can electrons.<br>Specifically, he postulated that the wavelength of ALL particles was related to their respective momenta by what is <br>now known as the de Broglie relation. A direct consequence of this relation is the prediction of interference patterns similar to those produced by photons passing through narrow slits. As a result of this prediction, a simple proof for the wave nature of matter can be constructed to demonstrate this interference pattern. Perhaps the most difficult obstacle in designing this experiment is in finding a diffraction grating with the appropriate spacing to produce the desired interference. | In 1924, Lois de Broglie proposed that as photons can be seen as both waves and particles, so too can electrons.<br> | ||
Specifically, he postulated that the wavelength of ALL particles was related to their respective momenta by what is <br> | |||
now known as the de Broglie relation. A direct consequence of this relation is the prediction of interference <br> | |||
patterns similar to those produced by photons passing through narrow slits. As a result of this prediction, a <br> | |||
simple proof for the wave nature of matter can be constructed to demonstrate this interference pattern. Perhaps <br> | |||
the most difficult obstacle in designing this experiment is in finding a diffraction grating with the appropriate <br> | |||
spacing to produce the desired interference. | |||
==Equipment== | ==Equipment== |
Revision as of 20:57, 25 October 2009
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Electron DiffractionPurpose1) To demonstrate the wave properties of electrons. TheoryIn 1924, Lois de Broglie proposed that as photons can be seen as both waves and particles, so too can electrons. Specifically, he postulated that the wavelength of ALL particles was related to their respective momenta by what is Equipment
Safety
ProcedureThe procedure should be followed from the Lab Manual experiment 3, electron diffraction. The following circuit was set up, with the following modification: The low voltage bias was inverted; a multimeter was put in series between the positive HV source and plug G7 on the mount to measure current. NOTE: the max voltage measurable by the multimeter is 1000V. It is important to only measure current with the multimeter while it is connected to prevent damage to the instrument as up to 5kV will be used in this experiment. Raw Data
AnalysisErrorSummaryAcknowledgments |