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Updated: Aug 19, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
Published on: June 28, 2016
High-q-resolution neutron scattering technique using triple-axis spectrometers
Guangyong Xu1, P M Gehring, V J Ghosh
1Physics Department, Brookhaven National Laboratory, Upton, NY 11973, USA. gxu@bnl.gov
Abstract:
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.
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