Examining the Dimension of a Photon Impacting an Electron

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To remove an electron from a H-like atom, the action of a photon is required. But what is the dimension of a photon, that hits the electron? If it is considered a wave, then is it possible to have just energy without mass, and it is known that the extra energy of the photon is imparted to the electron as K.E, but if it has an extremely small radius, then the electron should not be able to move.Can somebody please explain this?
 
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There is no such thing as the "radius" of photon. Interaction of photon and electron has nothing to do with the "dimensions" of the photon. The EM wave nature of the photon is responsible for the interaction and not the "dimensions" of photon. It seems that you are viewing it as a billiards ball collision.
 

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