Resolution considerations for polarized triple-axis spectrometry

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Abstract

It is well known that the cross-sections for triple-axis polarized beam spectroscopy depend on the relative orientation of the neutron polarization and the momentum transfer Q. This orientational dependence of the cross-sections can give rise to large resolution effects when the direction of Q varies substantially over the resolution function, which is often the case with polarized beam measurements because relaxed resolution is frequently employed to compensate for reduced intensities. This is also true when measurements are made at small wave vectors, as is necessary for amorphous materials. We find that the positions of excitations can be shifted significantly, and the intensities can deviate by a factor of two or more from the ideal case.

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