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Electron double slit experiment

  1. Jun 18, 2015 #1
    Is there an electric or magnetic field from the electron present in the deconstructive regions of the electron interference pattern?
     
  2. jcsd
  3. Jun 18, 2015 #2
    The electromagnetic field is everywhere, there is nothing special going on in the darker (deconstructive) regions seen in an interference pattern.
     
  4. Jun 19, 2015 #3
    I mean if I placed an electron in the deconstructive region would it experience a force from the electron that's being fired through the slits?
     
  5. Jun 19, 2015 #4

    bhobba

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    Electrons are not point particles. The Heisenberg uncertainty principle forbids them being placed anywhere since that would mean it has a definite position and momentum.

    Thanks
    Bill
     
  6. Jun 19, 2015 #5
    Okay, say the electron is trapped in an atom which is in the deconstructive region, the atom experiences a dipole moment, during that dipole moment does the electric field from the electrons being fired through the slits effect the atom? or is the electric field at the deconstructive region canceled out?
     
  7. Jun 19, 2015 #6

    bhobba

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    Again - atoms are quantum objects and QED would be necessary to analyse your situation.

    But, due to the symmetry of the situation, there wouldn't be any electric field - at any point what's on one side will cancel the other - think about it.

    Thanks
    Bill
     
  8. Jun 19, 2015 #7
    Sorry I don't follow, could you explain further about the symmetry.
     
  9. Jun 20, 2015 #8

    bhobba

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    Say you have two negative charges and have a positive one in the middle. Now its obvious that the fields of the charges cancel in the middle and nothing happens to the positive charge. Interestingly you don't have to evoke that - simply use symmetry. Say if you are in front of the charges it goes to the right. Now go to the back of the charges - its exactly the same situation physically - but now it goes to the left. But since its physically the same it cant do that. It must therefore not move. This is a symmetry argument and in some cases its all you need to solve a problem. The same thing happens with your situation. Imagine you are in the middle of a trough and view it from the front and back - its the same - so - guess what - there will be no field. The same if you are in a crest.

    Something for you to think about - does this happen if you are not on a crest or in a trough or if you move to the edges of the pattern.

    Thanks
    Bill
     
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