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Homework Help: Time-dependent perturbation theory question not a hard one

  1. Mar 7, 2010 #1
    1. The problem statement, all variables and given/known data

    A hydrogen atom is placed in a uniform electric field E(t) given by E(t) = Enaught*exp(-a*t) (where a is a constant) for t >0.

    The atom is initially in the ground state. What is the probability that, as
    t→∞ , the atom makes a transition to the 2p state?

    I know how to do this problem in general, but I'm just curious if by 2p state it means |2 0 0> or |2 1 0>...I want to go with the former, but is that what others would do? Or is it even going to matter?

    Thanks so much!
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Mar 7, 2010 #2


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    2s would mean n=2, l=0; 2p means n=2, l=1. If I recall correctly, the electric dipole transition ends up requiring l to change by 1.
  4. Mar 7, 2010 #3
    Ah, yes, of course! Thank you! I'd lose my head if it wasn't attached...
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