Structure of hydrogenous liquids: separation of coherent and incoherent cross sections using polarised neutrons

International Conference on Polarised Neutrons for Condensed Matter Investigations 2014

Stunault, A.^1 ; Vial, S.^1 ; Pusztai, L.^1 ; Cuello, G.J.^1 ; Temleitner, L.^2

Institut Laue-Langevin, 71 Av. des Martyrs CS 20156, Grenoble

F-38042, France^1

Institute for Solid State Physics and Optics, Wigner Centre for Physics, Hungarian Academy of Science, Budapest, Hungary^2

关键词: Coherent signals;    Coherent structure;    Hot neutrons;    Incoherent signals;    Polarisation analysis;    Polarised neutrons;    Scattered intensity;    Scattering intensity;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/711/1/012003/pdf
DOI  :  10.1088/1742-6596/711/1/012003

来源: IOP

【 摘 要 】

The determination of the coherent structure factor of hydrogenous liquids is very difficult: while X-rays are barely sensitive to hydrogen, neutrons results still lack accuracy due to the contamination of the scattering intensities by a huge spin-incoherent signal from the1H atoms. Using polarised neutrons with polarisation analysis, one can experimentally separate the coherent and incoherent contributions to the scattered intensity. We present the upgrade of the D3 polarised hot neutron diffractometer at ILL to study hydrogenated liquids. We show first data obtained from a test sample of water and detail the data reduction leading to an unprecedented accuracy in the extraction of the coherent signal, representative of the structure.