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Transition in LS-coupling confusion !

  1. May 31, 2012 #1
    Transition in LS-coupling confusion ! :)

    Hello :)
    Lets take for example a 2 electron system with l1,s1 and l2,s2. One electron changes energy due to electric dipole.

    I understand the rules for electrons in electric dipole transitions:
    1) Δl = +/- 1 (parity flips)
    2) Δml = 0 or +/- 1
    3) Δms = 0

    But I dont get a selection rule for the terms !

    One of the acceptable transitions is :
    ΔL = 0
    But if (1) Δl cant be 0 and (2) Δml = 0 or +/- 1 how is this possible ? :)

    Because to my understanding L = l1 + l2 in vector form.
     
    Last edited: May 31, 2012
  2. jcsd
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