Different viewpoints of electric dipole–electric dipole interaction in the calculation of the energy transfer rate of rare earth ions in insulators

The physical mechanism of the electric dipole–electric dipole (ED–ED) interaction may be looked at from several viewpoints in the calculation of the ED–ED energy transfer rate of rare earth ions in insulators. In this article, we demonstrate the equivalence of the results calculated from taking the ED–ED interaction as an energy transfer operation, or as a correction operator to the zero-order wavefunction of the donor–acceptor system.