Why Does Photoionization of H2 Exhibit Multiple Ionization Thresholds?

[djelovin]

How come that in photoionitation of H2 molecule we have multiple (>2) ionization thresholds? Is there any good literature on this matter?

 

[Claude Bile]

Because electrons can occupy more than 1 state.

Each state has its own ionization threshold.

Claude.

 

[djelovin]

Thanks tor answer Claude!

 

[wglab]

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.

 

[djelovin]

In fact I was referring to doubly excited resonant states!