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Measurements of Dynamic Contributions to Coherent Neutron Scattering

机译：测量相干中子散射的动态贡献

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In this manuscript, we are investigating the contribution of dynamic membrane properties of phospholipid membranes to coherent scattering signals under grazing incidence. Spectroscopic measurements under grazing incidence can provide useful insight into the properties of biological membranes; however, they are often impeded by weak signals. By using grazing-incidence small-angle neutron scattering (GISANS) to identify a dynamic scattering contribution, we are able to independently corroborate the existence of a previously found dynamic mode, now measured by grazing-incidence neutron spin echo spectroscopy (GINSES). Additionally, by increasing the speed of measurement compared to GINSES from several days to hours, we were able to explore the temperature behavior of this mode in phospholipid membranes. These dynamic modes of the membranes show a wavelength of around 700 Å in-plane of the membrane and are most pronounced around 37 a??C and strongly decrease at lower temperatures below 25 a??C before vanishing at 20 a??C. We therefore speculate that they may be linked to biologically relevant functions of the membranes themselves. To our knowledge, this is the first report of an investigation of that membrane mode by means of GISANS.
机译：在此手稿中，我们正在研究在掠入射下磷脂膜的动态膜特性对相干散射信号的贡献。掠入射下的光谱测量可以提供对生物膜特性的有用见解;但是，它们通常会受到微弱信号的阻碍。通过使用掠入射小角中子散射（GISANS）来识别动态散射贡献，我们能够独立地证实以前发现的动态模式的存在，现在通过掠入射中子自旋回波谱仪（GINSES）对其进行了测量。此外，通过将与GINSES相比的测量速度从几天提高到几小时，我们能够探索这种模式在磷脂膜中的温度行为。膜的这些动态模式显示出约700埃的波长。膜在膜的平面内，最明显的是在约37a -1℃附近，并在低于25 a -1℃的较低温度下急剧下降，然后在20 a -1℃下消失。因此，我们推测它们可能与膜本身的生物学相关功能有关。据我们所知，这是通过GISANS对该膜模式进行研究的第一份报告。

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