Matrix Element

  1. Does anyone know what the formula is for the following:

    <j m | S^2_{+} |j m > = ?

    Reference to equations in Sakurai would be helpful in deriving the relation. I would suspect 3.5.37 but what about the delta_j j' ?

    Does anyone know what I'm talking about?
  2. jcsd
  3. 3.5.35 a

    <j',m|J^2 |j,m> = j(j+1)hbar^2 delta_j j' delta m m'

    3.5.37 is

    J_+ |j,m> = c_jm^+ |j,m+1>
  4. Matterwave

    Matterwave 3,865
    Science Advisor
    Gold Member

    These appear to be formulas for finding the spin, and or angular momentum, of a wave-function. What is your question exactly?
  5. nevermind.
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