X-ray natural circular dichroism in langasite crystal

被引：7

作者：

Oreshko, Alexey P. ^{[1
]}

Ovchinnikova, Elena N. ^{[1
]}

Rogalev, Andrei ^{[2
]}

Wilhelm, Fabrice ^{[2
]}

Mill, Boris V. ^{[1
]}

Dmitrienko, Vladimir E. ^{[3
]}

机构：

[1] Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119991, Russia

[2] European Synchrotron Radiat Facil, 71 Ave Martyrs,CS 40220, F-38043 Grenoble, France

[3] Russian Acad Sci, AV Shubnikov Inst Crystallog, Fed Sci Res Ctr Crystallog & Photon, Leninskiy Prospekt 59, Moscow 119333, Russia

来源：

JOURNAL OF SYNCHROTRON RADIATION | 2018年 / 25卷

基金：

俄罗斯基础研究基金会;

关键词：

optical activity; circular dichroism; X-ray absorption spectra; OPTICAL-ACTIVITY; SINGLE-CRYSTAL; POLARIZATION; LA3GA5SIO14; DIFFRACTION; ABSORPTION; ANISOTROPY;

D O I：

10.1107/S1600577517015387

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Optical activity in the X-ray range stems from the electric-dipole-electric-quadrupole interference terms mixing multipoles of opposite parity, and can be observed exclusively in systems with broken inversion symmetry. The gyration tensor formalism is used to describe the X-ray optical activity in langasite La3Ga5SiO14 crystal with the P321 space group. An experimental study of the X-ray natural circular dichroism (XNCD) near the Ga K-edge in La3Ga5SiO14 single crystal was performed at ESRF beamline ID12, both along and perpendicular to the crystal optical axis. The combination of the quantum mechanical calculations and high-quality experimental results has allowed us to separate the contributions into X-ray absorption and XNCD spectra of Ga atoms occupying three distinct Wyckoff positions.

引用

页码：222 / 231

页数：10

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