Photoabsorption cross sections

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N2.png O2.png CH4.png H2O.png N2.png O2.png CH4.png H2O.png If we look in to 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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