Verbeni Roberto, D'Astuto Matteo, Krisch Michael, Lorenzen Maren, Mermet Alain, Monaco Giulio, Requardt Herwig, Sette Francesco
European Synchrotron Radiation Facility, B.P. 220, F-38043 Grenoble Cedex, France.
Rev Sci Instrum. 2008 Aug;79(8):083902. doi: 10.1063/1.2968118.
The energy scale of a triple-axis x-ray spectrometer with meV energy resolution based on perfect silicon crystal optics is calibrated, utilizing the most recent determination of the silicon lattice parameter and its thermal expansion coefficient and recording the dispersion of longitudinal acoustic and optical phonons in a diamond single crystal and the molecular vibration mode in liquid nitrogen. Comparison of the x-ray results with previous inelastic neutron and Raman scattering results as well as with ab initio phonon dispersion calculations yields an overall agreement better than 2%.
基于完美硅晶体光学元件、具有毫电子伏特能量分辨率的三轴X射线光谱仪的能量标度得到了校准，校准过程利用了硅晶格参数及其热膨胀系数的最新测定结果，并记录了金刚石单晶中纵向声学和光学声子的色散以及液氮中的分子振动模式。将X射线结果与先前的非弹性中子和拉曼散射结果以及与从头算声子色散计算结果进行比较，得到的总体一致性优于2%。
