Vaccari M, Fornasini P
Istituto Nazionale per la Fisica della Materia and Dipartimento di Fisica, Università di Trento, I-38050 Povo (Trento), Italy.
J Synchrotron Radiat. 2006 Jul;13(Pt 4):321-5. doi: 10.1107/S0909049506018504. Epub 2006 Jun 15.
The correlated Einstein and Debye models for EXAFS parallel mean-square relative displacement (MSRD) are derived from the general expression in terms of eigenfrequencies and eigenvectors of the dynamical matrix, without ad hoc assumptions. The two models are generalized to parameterize also the EXAFS perpendicular MSRD. The physical meaning of Einstein frequencies, as well as the application of the Debye model to crystals with more than one atom per cell, are critically discussed.
用于扩展X射线吸收精细结构（EXAFS）平行均方相对位移（MSRD）的相关爱因斯坦模型和德拜模型，是从基于动力学矩阵的本征频率和本征向量的一般表达式推导出来的，无需特殊假设。这两个模型也被推广以参数化EXAFS垂直MSRD。对爱因斯坦频率的物理意义以及德拜模型在每个晶胞中有多个原子的晶体中的应用进行了批判性讨论。
