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Homework Help: [Quantum Mechanics] Anharmonic oscillator

  1. Sep 18, 2014 #1

    how to compute <n|ξ^4|n>?

    The problem is above
    I guess the ladder operator becomes some very ugly term. There should be a trick to compute <n|ξ^4|n>. Could anyone tell me?
  2. jcsd
  3. Sep 18, 2014 #2
    I found a solution : )

    just start with ξ = (a+ + a-) * sqrt(mw/2h)
    and keep dealing with (a+)φ and (a-)φ.
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