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Homework Help: Help! quantum mech hydrogen molecule and spin

  1. Dec 30, 2004 #1
    Hi,
    I'm confused once again about a spin problem.

    The nuclei in a hydrogen molecule are identical protons. Spin states can be ortho (triplets) with parallel spin or para (singlets) with antiparallel spin. What are the three lowest energies for the para and ortho hydrogen molecules?

    Answer:
    Ortho: l = 1,3,5
    Para: l=2,4,6

    The answer says that for even l the two proton spins have total spin zero (para) and for odd l they have total spin one (ortho). This problem doesn't isn't supposed to be hard, I'm just very confused about the concept of spin.

    Please help!

    Thanks
     
  2. jcsd
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