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Excited state

  1. Sep 8, 2011 #1

    i have a question about excited state:

    let me say you have an atom and then you use light to get the electron to a higher energy level.

    does this mean, that there is always a spin change, cause as far as i know the spin of a photon is 1.

    but what happens if you have an electron with spin 1/2 and this electron absorbs a photon with spin 1. i know, that you cannot get an electron with spin 3/2, but on the other hand the spin is a conserved quantity, so how does this work out?
  2. jcsd
  3. Sep 8, 2011 #2
    Spin is not a conserved quantity. Total angular momentum of the system is conserved.
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