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How to pronounce this term symbol?

  1. Jul 26, 2015 #1

    td21

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    $$5^{2}S_{\frac{1}{2}}$$
    My guess is five-two-S-one-over-two. Any suggestion is appreciated. Thanks.
     
  2. jcsd
  3. Jul 27, 2015 #2

    blue_leaf77

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    We usually pronounce your "one-over-two" as "one-half".
     
  4. Jul 27, 2015 #3

    NascentOxygen

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    In what branch of science does this expression come from?

    Absent further details, I'm tempted to say ##5^2## is pronounced "five squared".
     
  5. Jul 27, 2015 #4

    blue_leaf77

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    I believe this is from the so-called term symbol for the state specification of many-electron atom.
     
  6. Jul 28, 2015 #5
    The 5 is not squared, 5 and 2 have different meanings.
    See here for example
    http://www.astro.sunysb.edu/fwalter/AST341/qn.html

    I think pronunciation is not really relevant. You don't communicate these things verbally.
     
  7. Jul 28, 2015 #6
    Why is there a 5 in front? As far as I know, the term symbol shouldn't have a 5 in front.
     
  8. Jul 28, 2015 #7
    I thought that the 5 is out of place too.
    But that link seems to suggest a quantum number n that goes in front.
     
  9. Jul 28, 2015 #8

    blue_leaf77

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    That's indeed uncommon, but probably that indicates that the valence shell, which is the only one incomplete, corresponds to n=5.
     
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