Phillips J C, Templeton D H, Templeton L K, Hodgson K O
Science. 1978 Jul 21;201(4352):257-9. doi: 10.1126/science.201.4352.257.
Diffraction of monochromatized synchrotron radiation by crystals of cesium hydrogen tartrate has been used to measure the magnitude and phase of x-ray scattering for cesium near the LIII absorption edge. In this wavelength region the scattering amplitude of cesium is reduced by as much as 25 electrons per atom, compared to scattering of copper Kalpha x-rays. This change, which varies as a function of wavelength, affects the diffraction intensities in a manner similar to isomorphous substitution, and it is large enough to have promise for phase determination in the study of macromolecular structures. This experiment also demonstrates that accurate diffractometer measurements are possible with synchrotron radiation produced by an electron storage ring.
酒石酸氢铯晶体对单色化同步辐射的衍射已被用于测量铯在LIII吸收边附近的X射线散射的大小和相位。在这个波长区域，与铜Kα X射线的散射相比，铯的散射振幅每个原子减少多达25个电子。这种随波长变化的变化以类似于同晶置换的方式影响衍射强度，并且其足够大，有望用于大分子结构研究中的相位确定。该实验还表明，利用电子储存环产生的同步辐射进行精确的衍射仪测量是可行的。
