This shows both in a quantum mechanical and classical manner how SESANS works

1. Shifting of eigen states Focussing of eigen states Inhomogeneities -> phase shift -> depolarisation + - + - + - + - Low field: correlation short distance + - + - + - + - spin-echo length or = + + - + - + - + - High field: correlation long distance

2. Classical explanation with Larmor precession Keller et al. Neutron News 6 , (1995) 16 Rekveldt, NIMB 114 , 366 (1996). Precession angle proportional to: scattering angle 0 + - + - + - + - height angle