= Frenkel exciton
{c}
A <Frenkel exciton> is an <exciton> whose internal excitation is concentrated on the scale of one molecule or <unit cell>. The local excitation can transfer between sites; localized internal structure does not require an immobile <center of mass>. The large-radius <Wannier-Mott exciton> approximation cannot simply be extrapolated to this limit.<Excitons in Semiconductor Quantum Dots by Matjaž Humar>[§3, printed p. 6: small-radius Frenkel contrast]{ref}
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