Why Does Photoionization of H2 Exhibit Multiple Ionization Thresholds?

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Discussion Overview

The discussion centers on the phenomenon of multiple ionization thresholds observed in the photoionization of the H2 molecule. Participants explore the underlying reasons for this behavior, including the roles of electron states and excitations, within the context of theoretical and experimental frameworks.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant questions why photoionization of H2 exhibits more than two ionization thresholds and seeks relevant literature.
  • Another participant suggests that the presence of multiple electron states leads to distinct ionization thresholds for each state.
  • A different participant notes that the multiple low energy ionization limits are associated with the excitation of one electron to threshold, along with vibrational and/or rotational excitation of the ion core.
  • One participant clarifies that they were specifically referring to doubly excited resonant states in their inquiry.

Areas of Agreement / Disagreement

Participants present multiple perspectives on the causes of multiple ionization thresholds, indicating that there is no consensus on a singular explanation.

Contextual Notes

The discussion involves assumptions about electron states and excitations that are not fully defined, and the implications of these factors on the observed thresholds remain unresolved.

djelovin
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How come that in photoionitation of H2 molecule we have multiple (>2) ionization thresholds? Is there any good literature on this matter?
 
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Because electrons can occupy more than 1 state.

Each state has its own ionization threshold.

Claude.
 
Thanks tor answer Claude!
 
If you are referring to the multiple low energy ionization limits, they are due to the excitation of one electron to threshold, along with vibrational and/or rotational excitation of the resulting ion core.
 
In fact I was referring to doubly excited resonant states!
 

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