Selection rules for multiphoton vs single-photon ionization

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SUMMARY

The discussion focuses on the selection rules for ionization processes in homonuclear diatomic molecules, specifically comparing nonresonant 2-photon ionization with 1-photon ionization. For 1-photon ionization, the change in total orbital angular momentum must be ±1 due to the single quantum of angular momentum carried by the photon. In contrast, for nonresonant 2-photon ionization, the change in angular momentum is ±2. The gerade/ungerade selection rules are deemed irrelevant in this context as they pertain to the ionization process.

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  • Understanding of quantum mechanics principles, particularly angular momentum
  • Familiarity with ionization processes in atomic and molecular physics
  • Knowledge of photon interactions and their quantum properties
  • Basic concepts of selection rules in quantum transitions
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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?
 
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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?
 
Sounds right.
 

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