A triple-axis neutron spectrometer
consists of three independently controlled
axes of rotation for the sample, monochromator, and analyzer
crystals, as shown in Figure 2.1.
Figure 2.1: Schematic illustration of a neutron scattering spectrometer.
The beam is first diffracted from the monochromator, then it
hits the sample. Neutrons scattered from the sample are diffracted by the
analyzer crystal and finally reach the detector.
The three axes of rotations allow for selection of well defined incident
and scattered wavevectors at the sample.
Triple-axis spectrometers are built for inelastic
scattering, but they may also be used to determine lattice spacings.
Inelastic neutron scattering is performed with
a beam neutrons of wavelength 
Å
The analyzer crystal provides a wavelength selection
with an accuracy of 
.
What is the the energy resolution of the spectrometer in this configuration?
Laszlo Mihaly
Thu Oct 31 13:23:11 EST 1996
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