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Homework Help: Lifetime an atom can spend in an excited state

  1. Nov 6, 2007 #1
    Can you please give me a hint to start this problem?

    The Einstein Aij coefficients are related to the lifetime an atom can spend in an excited state i before going to state j. Using Heisenberg’s Uncertainty Principle, show that large values of Aij lead to line profiles with large values of (lamda)

  2. jcsd
  3. Nov 6, 2007 #2


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    Heisenberg uncertanty principle: [tex] \Delta E \cdot \Delta t \sim \hbar [/tex]

    Let delta-t be the lifetime of the state. How is E related to lambda?
    Last edited: Nov 6, 2007
  4. Nov 6, 2007 #3
    Oh, thanks a lot! That is very easy now!!
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