利用Borrmann效应和扭曲光子束的二向色信号的统一表述
A unified formulation of dichroic signals using the Borrmann effect and twisted photon beams
摘要：
本文用有效波矢描述了由Borrmann效应和具有拓扑电荷l = 1的扭曲光子束产生的二向色性信号。这种统一适用于非磁性材料和磁性材料。与离子相关的电子自由度被封装在以前用于解释传统的二向色性和布拉格衍射增强的原子共振的多极。利用Borrmann效应与线性偏振光束的二向色信号呈现包括十六极的电荷状多极。用携带自旋极化（圆极化）的扭曲光束和相反的缠绕数获得的二向色信号之间的差异呈现电荷状原子多极，而单独携带线性极化的扭曲光束呈现磁性（时间奇数）多极。类电荷多极子包括四极子，磁多极子包括偶极子和八极子。我们讨论的实用性和相对优势的光谱利用这两个非常密切相关的过程。
英文摘要：
Dichroic signals derived from the Borrmann effect and a twisted photon beam with topological charge l = 1 are formulated with an effective wavevector. The unification applies for non-magnetic and magnetic materials. Electronic degrees of freedom associated with an ion are encapsulated in multipoles previously used to interpret conventional dichroism and Bragg diffraction enhanced by an atomic resonance. A dichroic signal exploiting the Borrmann effect with a linearly polarized beam presents charge-like multipoles that include a hexadecapole. A difference between dichroic signals obtained with a twisted beam carrying spin polarization (circular polarization) and opposite winding numbers presents charge-like atomic multipoles, whereas a twisted beam carrying linear polarization alone presents magnetic (time-odd) multipoles. Charge-like multipoles include a quadrupole, and magnetic multipoles include a dipole and an octupole. We discuss the practicalities and relative merits of spectroscopy exploiting the two remarkably closely-related processes.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
