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I Selection rules for multiphoton vs single-photon ionization

  1. Sep 4, 2016 #1
    Question: For ionization of a homonuclear diatomic, how do the selection rules differ for a nonresonant 2-photon ionization process and a 1-photon ionization process?
  2. jcsd
  3. Sep 5, 2016 #2
    Specifically, I am wondering about the angular momentum selection rules. For a 1-photon ionization, since the photon has 1 quantum of angular momentum, I think the change in the total orbital angular momentum of the molecule would have to be +/- 1. And for a 2-photon ionization, which I'm trying to do non-resonantly, it would be +/- 2.
    The gerade/ungerade selection rules should not matter since these are being ionized.
    Does this seem reasonable?
  4. Sep 6, 2016 #3


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    Staff: Mentor

    Sounds right.
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