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## Main Question or Discussion Point

Probably a stupid question but when the energy of x ray photons striking atomic electrons increase, why is it that the probability of photoionisation decreases?

I mean, obviously there are absorption edges corresponding to the K, L, M etc edges but the *general* trend is that the the absorption probability decreases with increasing photon energy. Why is this the case?

I mean, obviously there are absorption edges corresponding to the K, L, M etc edges but the *general* trend is that the the absorption probability decreases with increasing photon energy. Why is this the case?