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I (hyper)fine structure of Rb

  1. Aug 24, 2017 #1
    Hello everybody,

    while I tried to understand the Rubidium level scheme, I realized that I have some issues concerning the energy levels in general... If in addition to the orbital Momentum the spin momentum of an electron is considered for example the p level splits to the 2P1/2-level and the 2P3/2-level. So there are the cases that the total angular momentum of the electron shell can be J=L-S=1-1/2 or J=L+S=1+1/2.
    Same thing as hyperfine splitting: The 2P1/2-level splits up into F=I+J=3 and F=I-J=2.
    Why does it split into two levels and not more? Is there a way to describe this with the orientation of the spin momentum vector with regard to the angular momentum vector?

    Many thanks in advance!!! Best regards,
  2. jcsd
  3. Aug 26, 2017 #2


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    Staff Emeritus
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    One electron (one angular momentum), two spin states.
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