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Chemistry LibreTexts

15: Energy and Charge Transfer

  • Page ID
    • 15.1: Electronic Interactions
      In this section we will describe processes that result from the interaction between two or more molecular electronic states, such as the transport of electrons or electronic excitation.
    • 15.2: Förster Resonance Energy Transfer (FRET)
      Förster resonance energy transfer (FRET) refers to the nonradiative transfer of an electronic excitation from a donor molecule to an acceptor molecule. This electronic excitation transfer, whose practical description was first given by Förster, arises from a dipole–dipole interaction between the electronic states of the donor and the acceptor, and does not involve the emission and reabsorption of a light field.
    • 15.3: Excitons in Molecular Aggregates
      The absorption spectra of periodic arrays of interacting molecular chromophores show unique spectral features that depend on the size of the system and disorder of the environment. We will investigate some of these features, focusing on the delocalized eigenstates of these coupled chromophores, known as excitons. These principles apply to the study of molecular crystals, Jaggregates, photosensitizers, and light-harvesting complexes in photosynthesis.
    • 15.4: Multiple Particles and Second Quantization
      In the case of a large number of nuclear or electronic degrees of freedom (or for photons in a quantum light field), it becomes tedious to write out the explicit product-state form of the state vector. Under these circumstances it becomes useful to define creation and annihilation operators. This representation is sometimes referred to as “second quantization”
    • 15.5: Marcus Theory for Electron Transfer
      Here we describe the rates of electron transfer between weakly coupled donor and acceptor states when the potential energy depends on a nuclear coordinate, i.e., nonadiabatic electron transfer. These results reflect the findings of Marcus’ theory of electron transfer.

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