Emission or Absorption of a Photon - Dipole Needed?

AI Thread Summary
Photon emission or absorption typically occurs through the oscillation of dipoles, driven by an external force. Systems that do not utilize dipole oscillation for this process are questioned, with the consensus leaning towards the necessity of charge movement for photon interaction. While dipoles are the primary means for such interactions, higher-order multipoles like quadrupoles and octopoles can also emit and absorb photons. The discussion emphasizes that without charge movement, photon emission or absorption is unlikely. Overall, dipole oscillation remains a fundamental mechanism in these processes.
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If photons are emitted or absorbed when a pair or a collection of particles, that are or behave as dipoles, undergo oscillation by some driving force, are there any systems that do NOT use a single or collective dipole oscillation to emit or absorb a photon?
 
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no charge moving no photon as it seems to me.
 
All multipoles (other than monopole), quadrupole, octopole, etc.
can emit and absorb photons.
 
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