A simple coupled harmonic oscillator model is used to test the SCF and adiabatic approximations for coupled-mode systems. Both approximations are quite good; both fail when the unperturbed frequencies of the two modes approach degeneracy. While for two-mode systems the approximations are roughly comparable, for real molecules, the more easily applied SCF is preferable. Semiclassical quantization may be used with both approximations.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Condensed Matter Physics
- Atomic and Molecular Physics, and Optics
- Surfaces and Interfaces