 Neutron spin echo instruments can analyze the inelastic broadening of the SANS intensity and thereby analyze the motion of the macromolecular objects.A coarse analogy would be a photo with a certain opening time instead of the SANS like snapshot(So we can analyze the vibration frequency of the molecules as well as arrangement).The opening time corresponds to the Fourier time which depends on the setting of the NSE spectrometer, it is proportional to the magnetic field (integral) and to the third power of the neutron wavelength.