Graduate Why Do UV Photoabsorption Cross Sections Show a Kink at 10-100 Angstrom?

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The discussion centers on the observation of a kink in UV photoabsorption cross sections for various gases at wavelengths between 10-100 Angstrom. This kink indicates that the energy at these wavelengths is sufficient to initiate ionization processes. As the energy increases, more ionization processes become accessible, leading to an increase in the number of steps observed in the cross sections. The phenomenon is linked to the underlying physics of ionization and absorption in gases. Understanding this kink is crucial for interpreting UV photoabsorption behavior in different atmospheric conditions.
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If we look into the UV photoabsorption cross sections of different gases, a kink in the cross section is seen at wavelength between 10-100 Angstrom. Can some one explain why this happens ?
 

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This typically means the energy is sufficient for some ionization process for wavelengths smaller than the kink location.
You get more of th se steps for higher energies when more ionization processes become possible. Here is an example .
 

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