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ANALYSIS OF TIME-OF-FLIGHT DIFFRACTOMETER DATA …

Version (December 2000) ANALYSIS OF time -OF-FLIGHTDIFFRACTOMETER DATAFROM LIQUID AND AMORPHOUS SAMPLESI ncorporating the SANDALS survival , , , ISIS FacilityRutherford Appleton LaboratoryChilton, Didcot, Oxon OX11 0 QXTel: 01235-445543 (AKS)01235-445680 (WSH)01235-445358 (ACH)01235-556397 (DTB)23 TABLE OF CONTENTSSECTION 1: TIME-OF-FLIGHT The time of flight neutron diffraction Overview of diffraction theorySECTION 2: STEPS IN DATA ANALYSIS OF TOF diffraction Deadtime Normalizing to the incident beam Measuring the neutron cross Attenuation and multiple scattering Furnace Vanadium or standard sample Basic algorithm to determine differential cross Inelasticity (Placzek) Merging the data to form the structure ANALYSIS to pair correlation functionSECTION 3: STRUCTURE IN MOLECULAR LIQUID SYSTEMS BY H/DISOTOPIC SUBSTITUTION NEUTRON SCATTERING Isotopic subsitution neutron An example of a binary molecular mixtureSECTION 4: THE SANDALS SURVIVAL on to the SLS Front End file the SANDALS start a new end a of sample raw data and detector data the (Q) for uncorrected data (SQRAW) SQRAW res

6 1.1 The time of flight neutron diffraction experiment There are seven principle components to a time-of-flight diffraction experiment: 1. Production of neutrons in a target

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