Neutron Scattering

ô 0 .8
0
0
Im 0 .6
X ,a,
`RMRXI km,
,zum
0 .4
ccc .g1l
Figure 11 .8 : Resolution function of the Jülich NSE for beams of different divergence .
Solid lines : configuration with three correction coils, dashed lines : only two correction
coils .
amplitudes from the reference sample to yield S(Q,t)/S(Q) .
result of a typical experiment is shown in figure 11 .9 .
An example for the final
11 .6 Practical Aspects, Peculiarities
From the above description it follows that the NSE spectrometer measures the Fourier
transform S(Q, t) of the spectral part of S(Q, w) directly . As a consequence the average
count rate at the detector corresponds to half of all neutrons scattered from the Sample
into the solid angle of the detector (Fourierintegra4 . Therefore weck spectral features
are buried under the noise due to counting statistics . However the method is perfectly
adapted to relaxations that are performed by most of the scattering structure since the