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Doubts about the electron magnetic moment.

  1. Apr 12, 2014 #1

    According to this page and other sources I found the z-component of the electronic magnetic moment is greater than the classically calculated value due to relativistic effects. Which makes me wonder:

    1) What about the x and y components? I am completely lost as to why only the z axis is mentioned. I'm thinking that it is assumed that the axis of rotation of the electronand therefore the moment are aligned in that direction and therefore the x and y comps are 0. Am I right?

    2) How are relativistic effects sneaking in here? There isn't anything going really fast, which I thought (perhaps naively) was necessary for them to be relevant.

    Thank you.
  2. jcsd
  3. Apr 12, 2014 #2


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    Right. The z axis is chosen to be aligned with the spin.
    To make quantum mechanics compatible with special relativity, you need a different description of electrons - and spin is one result of that different description.
  4. Apr 12, 2014 #3
    Does that different description of electrons happen to be the Dirac equation?
  5. Apr 13, 2014 #4


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