Both possible time-ordered Feynman representations of the static coupling between molecules and through the propagation of a single virtual photon, time progressing upwards.
Feynman diagrams illustrating RET by virtual photon transfer. Diagram (a) illustrates virtual photon creation at and subsequent annihilation at with diagram (b) representing the opposite evolution.
Three of 12 distinct time-ordered representations of the fourth-order dispersion force. Process involves migration of two virtual photons from and or one from each.
Two of the 48 distinct illustrations of the fourth-order optically induced pair force. Represented above are (a) real photon absorption at coupled by migration of a virtual photon annihilated at , with stimulated re-emission of a real photon back into the auxiliary field. The opposite process is represented by (b).
One of the Feynman diagrams representing fourth-order LARET; a process mediated by a single virtual photon in the presence of throughput, off-resonant radiation assisting energy exchange between donor and acceptor.
Jablonski diagram, rate constants denoting processes determining the excited populations of molecules and . These processes involve among others, the spontaneous emission of photons from and lower energy emission (owing to IVR) of from .
Representative and population profiles, (a) and (b), respectively, following initial pulsed laser excitation. Values of and are chosen such that accounts for approximately 80% of the total decay of . Total rate of energy transfer is modestly increased by 50% through ; and are taken as equal.
Evolution of the optically modified donor-acceptor interaction as a function of time, highlighting system response to RET, LARET, and optically induced forces.
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