neutron scattering spin-echo neutron scattering neutron spin-echo spectroscopy CHMO:0000196 neutron spin-echo spectrometry spin-echo neutrons scattering neutron spin echo spectrometry neutron spin echo spectroscopy A method for determining structure by measuring the velocity of neutrons in known magnetic fields before and after scattering by the sample. The neutrons are scattered by the interaction of neutron spin with spins in the sample ('spin echo').