Setup for in situ surface investigations of the liquid/glass transition with (coherent) x rays

Setup for in situ surface investigations of the liquid/glass transition with (coherent) x rays
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使用(相干)X 射线对液体/玻璃化转变进行原位表面研究的设置

DOI:
10.1063/1.1599068
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发表时间:
2003
影响因子:
1.6
通讯作者:
W. Press
W. Press
中科院分区:
工程技术4区
文献类型:
--
作者:
T. Seydel;A. Madsen;M. Sprung;M. Tolan;G. Grübel;W. Press

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介绍了一种包括高效低温装置的专用装置,用于在较宽的温度范围(170-340K)内原位制备大表面积的原型有机玻璃成型器。这种设置为表面X射线和中子散射实验提供了必要的温度和振动稳定性,包括极其灵敏的X射线光子相关光谱(XPCS)技术。XPCS是利用第三代同步加速器产生的高相干光子通量实现的一种新兴方法。我们证明利用XPCS可以直接研究液体和过冷态下表面的微观运动。此外,我们还使用电荷耦合器件探测器记录了玻璃状态下表面上形成的静态散斑图案的二维图像。
A dedicated setup comprising an efficient cryogenic device for the in situ preparation of large surface areas of prototypical organic glass formers in a wide temperature range (170–340 K) is presented. This setup provides the necessary temperature and vibrational stability for surface x-ray and neutron scattering experiments, including the extremely sensitive technique of x-ray photon correlation spectroscopy (XPCS). XPCS is an emerging method which is made possible by the high coherent photon flux produced by third-generation synchrotrons. We demonstrate that microscopic motion at the surface can be studied in a direct way in the liquid and supercooled state using XPCS. In addition, we have used a charge-coupled-device detector to record two-dimensional images of static speckle patterns forming on surfaces in the glassy state.
A. Fajar 等人:“近晶-A-近晶-C_α^* 相变附近波动引起的克尔效应”分子晶体和液晶。
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