Neutron Scattering - JUWEL - Forschungszentrum Jülich

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KWS-3 7 Table 2. Samples for practicum; CV: samples for the contrast variation; FF, SF: sample for form and structure factor determination. �D2O 0 CV 3.6 FF, SF 10 CV 20 CV 30 CV 40 CV 50 CV 60 CV 76 FF �Spheres 1.00 0.96 0.9 0.8 0.7 0.6 0.5 0.4 0.24 I(0)[10 4 cm -1 ] 103 75.2 38 6.5 0.47 12.01 33.2 55.9 75.2 5 The experiment and data reduction All samples listed in Table 2 we will measure with (Sample) and without (Sample-DB) beamstop. The first one should be measured much longer than the second one. Additionally the empty cell [with (EC) and without (EC-DB) beamstop] and the black current (BC) run will be measured and used for data reduction of all datasets. What to measure? ISample, ISample-DB, IEC, IEC-DB, IBC [counts per current pixel, normalized by monitor] Sample transmission: T � I Sample�DB I EC �DB Empty cell and black current subtraction: I � (ISample � IBC ) � T� (IEC � IBC ) Absolute calibration: d� d� Q I(Q) � �� d� T� �D � IEC �DB ��(Q) where d sample thickness, T sample transmission, �D detector efficiency, �� solid angle per current pixel, counts on sample. 6 Experiment-Related Exercises Within our “one-day-experiment” at KWS-3 it would be nice to get as much as possible information about above mentioned sample, like: a) the form factor P(Q) of PS spheres from sample with �D2O=0.76; “real” radius R and polydispersity of the PS microspheres; b) the structure factor S(Q) in case of �D2O=0.04 and decide about the interactions between spheres: could we neglect the structure factor S(Q) during data analysis?
8 Vitaliy Pipich c) the scattering length density of PS spheres by H2O/D2O contrast variation. At matching point, the SLD of microspheres and water are equal. Polystyrene in microspheres is amorphous or crystalline?
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Member of the Helmholtz Association
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Forschungszentrum Jülich GmbH Jül
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�� 1 PUMA
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2 O. Sobolev, A. Teichert, N. Jünk
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2 POWDER DIFFRACTOMETER SPODI Conte
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2 M. Meven Contents 1 Introduction
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4 M. Meven a (hkl) Plane. Each plan
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SPHERES Backscattering spectrometer
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SPHERES 3 1 Introduction Neutron ba
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SPHERES 5 Fig. 2: The monochromator
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Page 86 and 87: SPHERES 9 neutron is scattered, it
Page 88 and 89: SPHERES 11 The stationary equilibri
Page 90 and 91: SPHERES 13 4. Summarize the tempera
Page 92 and 93: ________________________ DNS Neutro
Page 94 and 95: DNS 3 1 Introduction Polarized neut
Page 96 and 97: DNS 5 Monochromator horizontal- and
Page 98 and 99: DNS 7 3 Preparatory Exercises The p
Page 100 and 101: DNS 9 important and always necessar
Page 102: DNS 11 Contact �� Phone:
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Page 128 and 129: ________________________ KWS-3 Very
Page 130 and 131: KWS-3 3 1 Introduction Ultra small
Page 132 and 133: KWS-3 5 2. The standard Q-range of
Page 136 and 137: KWS-3 9 References [1] Eskilden, M.
Page 138 and 139: ________________________ RESEDA Res
Page 140 and 141: RESEDA 3 1 Introduction Neutrons ar
Page 142 and 143: RESEDA 5 various length values l ac
Page 144 and 145: RESEDA 7 In this expression, a norm
Page 146 and 147: RESEDA 9 spin flip from up to down
Page 148 and 149: RESEDA 11 The neutrons are counted
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Neutron Scattering - JUWEL - Forschungszentrum Jülich

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