The Neutron Spin-Echo Method

For the very small AVj values under consideration the above expression may be linearized, co-AVg. Due to the cosine modulating filter function the NSE instrument measures the cosine transform of S Q,oo). The detector output of the (ideal) NSE instrument at exact symmetry is  

The relaxation function is measured directly as a function of time. Therefore, any instrumental resolution correction consists of a simple point by point division by the result of a measurement of a resolution sample, instead of a tedious deconvolution that would be required for S Q,co) measured at a real - finite resolution - instrument. 

The large dynamic range - for a neutron instrument - of up to 1 1000 with one instrumental setting plus another two orders of magnitude if the wavelength is changed. 

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