High-q-resolution neutron scattering technique using triple-axis spectrometers.
A new technique is presented that gives a substantial increase in the wavevector q resolution of triple-axis spectrometers by matching the measurement wavevector q to the reflection taua of a perfect-crystal analyzer. A relative Bragg width of deltaq/Q approximately 10(-4) can be achieved with reasonable collimation settings. This technique is very useful in measuring small structural changes and line broadenings that cannot be accurately measured with conventional set-ups, while keeping all the strengths of a triple-axis spectrometer.
Xu
Guangyong
G
Physics Department, Brookhaven National Laboratory, Upton, NY 11973, USA. gxu@bnl.gov
Gehring
P M
PM
Ghosh
V J
VJ
Shirane
G
G