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What do the Ms in ml and ms quantum numbers stand for?

  1. Sep 12, 2013 #1
    I first thought magnetic, but that only makes sense for ml, they're both projections though, does anyone know what they stand for?

  2. jcsd
  3. Sep 12, 2013 #2
    m stands for magnetic
    s stands for spin
    l stands for ?

    Keep in mind that these are just labels of at most historical significance.
  4. Sep 12, 2013 #3
    I think it must just be 'momentum' from searching a bit more.
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