Spin Dephasing in the Extended Strong Collision Approximation
  For Markovian dynamics of field fluctuations we present here an extended strong collision approximation, thereby putting our previous strong collision approach (Phys. Rev. Lett. 83 (1999) 4215) into a systematic framework. Our new approach provides expressions for the free induction and spin echo magnetization decays that may be solved analytically or at least numerically. It is tested for the generic cases of dephasing due to an Anderson-Weiss process and due to restricted diffusion in a linear field gradient. 
Wolfgang R. Bauer (1), Walter Nadler (2 and 3) ((1) Universitaet   Wuerzburg, (2) Bergische Universitaet Wuppertal, (3) NIC ...