ქიმიის ტერმინთა განმარტებითი ლექსიკონი

Loss of coherence between the upper and lower states of a transition.

Note 1: The term “dephasing” arises from the density matrix formalism that is used in a phenomenological approach to simplify the description of the relaxation dynamics of a molecule coupled to its surroundings.

Note 2: Dephasing leads to either homogeneous broadening or inhomogeneous broadening depending on the system. The continually changing intermolecular interactions cause a shift of the frequency of the intramolecular vibration. If these  interactions change much more slowly than the amplitude of this shift,  heterogeneous  broadening  results  and cause a Gaussian band. If these interactions change much  faster than the amplitude of this shift,  homogeneous  broadening  occurs  and the observed band is a notionally narrowed Lorentzian band. In the general case the broadening due to dephasing is neither homogeneous nor heterogeneous and the line shape is neither Gaussian  nor Lorentzian.