Development of the Soft X-ray AGM-AGS RIXS beamline at the Taiwan Photon Source.
Development of the Soft X-ray AGM-AGS RIXS beamline at the Taiwan Photon Source.
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DOI：
10.1107/s1600577521002897
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发表时间：
2021-05-01
影响因子：
2.5
通讯作者：
Chen CT
中科院分区：
文献类型：
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作者：
Singh A;Huang HY;Chu YY;Hua CY;Lin SW;Fung HS;Shiu HW;Chang J;Li JH;Okamoto J;Chiu CC;Chang CH;Wu WB;Perng SY;Chung SC;Kao KY;Yeh SC;Chao HY;Chen JH;Huang DJ;Chen CT
据报道，位于台湾光子源的软 X 射线共振非弹性 X 射线散射 (RIXS) 的高分辨率和高效光束线的开发。我们报告了位于台湾光子源的用于软 X 射线共振非弹性 X 射线散射 (RIXS) 的高分辨率和高效光束线的开发。该光束线采用主动光栅单色仪（AGM）和主动光栅光谱仪（AGS）的光学设计来实现光栅色散的能量补偿原理。主动光栅用于减少散焦、慧差和高阶像差，并减少热变形和光学抛光引起的斜率误差。 AGS 安装在可旋转的花岗岩平台上，可实现大范围散射角的动量分辨 RIXS 测量。简要描述了为此光束线内部开发的几种高精度仪器。从该 AGM-AGS 光束线获得的最佳能量分辨率为 530 eV 时的 12.4 meV，分辨率达到 4.2 × 104，同时入射软 X 射线的带宽保持在 0.5 eV。为了证明高分辨率 RIXS 的科学影响，我们提供了一个对高温超导铜酸盐（即 La2–xSrxCuO4）进行动量分辨 RIXS 测量的示例。测量揭示了超导铜酸盐中的 A1g 屈曲声子，为研究这些声子与电荷密度波之间的耦合提供了新的机会。
The development of a high-resolution and highly efficient beamline for soft X-ray resonant inelastic X-ray scattering (RIXS) located at the Taiwan Photon Source is reported. We report on the development of a high-resolution and highly efficient beamline for soft X-ray resonant inelastic X-ray scattering (RIXS) located at the Taiwan Photon Source. This beamline adopts an optical design that uses an active grating monochromator (AGM) and an active grating spectrometer (AGS) to implement the energy compensation principle of grating dispersion. Active gratings are utilized to diminish defocus, coma and higher-order aberrations, as well as to decrease the slope errors caused by thermal deformation and optical polishing. The AGS is mounted on a rotatable granite platform to enable momentum-resolved RIXS measurements with scattering angles over a wide range. Several high-precision instruments developed in-house for this beamline are described briefly. The best energy resolution obtained from this AGM–AGS beamline was 12.4 meV at 530 eV, achieving a resolving power of 4.2 × 104, while the bandwidth of the incident soft X-rays was kept at 0.5 eV. To demonstrate the scientific impact of high-resolution RIXS, we present an example of momentum-resolved RIXS measurements on a high-temperature superconducting cuprate, i.e. La2–xSrxCuO4. The measurements reveal the A1g buckling phonons in superconducting cuprates, opening a new opportunity to investigate the coupling between these phonons and charge-density waves.