If the hyperfine field fluctuates during the lifetime  of the intermediate level due to jumps of the probe into another lattice position or from jumps of a near atom into another lattice position, the correlation is lost. For the simple case with an undistorted lattice of cubic symmetry, for a jump rate of  for equivalent places , an exponential damping of the static -terms is observed:
Here  is a constant to be determined, which should not be confused with the decay constant . For large values of , only pure exponential decay can be observed:
The boundary case after Abragam-Pound is , if , then: