Why does the light excitation causes strong dipole transitions but the electron beam excitation causes non dipole transitions?

28 August 2021 0 9K Report

I am trying to understand the difference between electron-beam and laser excitation of a sample. A lot of papers discuss the optical excitation strongly couples to strong dipole modes but the electron beam transfer larger momenta to sample and hence causes non-dipole transitions. I am having a hard time understanding this concept. Can anyone please guide me on this?

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