Department of Chemistry, University of California , 450 Rowland Hall, Irvine, California 92697-2025, USA.
Struct Dyn. 2013 Dec 18;1(1):014101. doi: 10.1063/1.4833560. eCollection 2014 Jan.
Nonlinear all-X-ray signals that involve large core-atom separation compared to the X-ray wavelengths may not be described by the dipole approximation since they contain additional phase factors. Expressions for the rotationally averaged 2D X-ray photon echo signals from randomly oriented systems that take this position-dependent phase into account for arbitrary ratio between the core separation and the resonant wavelength are presented. Application is made to the Se K-edge of a selenium dipeptide system.
与 X 射线波长相比，涉及较大的核心原子间距的非线性全 X 射线信号可能无法用偶极子近似来描述，因为它们包含额外的相位因子。本文提出了一种针对任意核心间距与共振波长之比的随机取向体系的二维 X 射线光子回波信号的旋转平均表达式，该表达式考虑了位置相关的相位。应用于硒二肽体系的 Se K 边缘。
