利用3 He自旋滤波器对JCNS SANS进行极化分析，
Unambiguous determination of structure parameters for soft matter samples made possible with polarization analysis on JCNS SANS using a 3He spin filter
摘要：
非相干背景会给标准小角中子散射测量带来固有问题。生物样品中含有氢，氢是一种强非相干散射体，因此产生了一种固有的背景源，这使得在特殊情况下难以确定相干散射参数。对于Q范围在0.1-0.5 Ω ^-1左右的情况尤其如此，在此情况下，对背景水平的不适当了解会导致在确定样本结构参数时产生歧义。偏振分析是一种消除这种模糊性的方法，它允许人们区分相干散射和非相干散射，即使相干散射只是总散射强度的一小部分。^3He自旋过滤器是完成这一任务的理想选择，因为它们允许分析大面积和大发散的散射中子束，而不会增加探测器背景或改变散射中子束的传播。本速写描述了^3He中子自旋过滤器的应用，该过滤器使用自旋交换光抽运方法极化，用于蛋白质样品的极化分析，以明确地提取相干散射强度。
英文摘要：
Incoherent background can create an intrinsic problem for standard small angle neutron scattering measurements. Biological samples contain hydrogen which is a strong incoherent scatterer thus creating an intrinsic source of background that makes determination of the coherent scattering parameters difficult in special situations. This can especially be true for the Q-range from around 0.1-0.5 Å^-1 where improper knowledge of the background level can lead to ambiguity in determination of the samples structure parameters. Polarization analysis is a way of removing this ambiguity by allowing one to distinguish the coherent from incoherent scattering, even when the coherent scattering is only a small fraction of the total scattered intensity. ^3He spin filters are ideal for accomplishing this task because they permit the analysis of large area and large divergence scattered neutron beams without adding to detector background or changing the prorogation of the scattered neutron beam. This rapid note describes the application of ^3He neutron spin filters, polarized using the spin-exchange optical pumping method, for polarization analysis on a protein sample to unambiguously extract the coherent scattered intensity.
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