Extremely high quality soft X-ray beam line BL25SU of SPring-8: instrumentation and research activities
Extremely high quality soft X-ray beam line BL25SU of SPring-8: instrumentation and research activities
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SPring-8 的极高品质软 X 射线束线 BL25SU：仪器和研究活动
DOI：
10.1016/s0168-9002(01)00739-2
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发表时间：
2001
影响因子：
1.4
通讯作者：
S. Suga
中科院分区：
文献类型：
--
作者：
S. Suga
SPring-8的双螺旋波荡器光束线BL 25 SU提供了高稳定性和足够光子通量的极高分辨率和明亮的软X射线光。具有非常高的圆偏振的螺旋度光在同一光轴上发射。基波辐射可以覆盖0.22 - 3 keV的hν区，其中2keV以下的hν区由变线距平面光栅的恒偏角单色器（VLSPGM）覆盖。高阶光的含量小于1%。通过Au费米边的光电发射，对VLSPGM的能量分辨率进行了准确的评价。通过使用中心凹槽密度为600/mm的光栅，在870 eV处实现了优于15，000的分辨率，而通过使用中心凹槽密度为1000/mm的光栅实现了优于20，000的分辨率。在BL 25 SU上永久性地串联设置了三个固体光谱实验站：（1）高分辨光电子能谱实验站（2）芯吸收磁圆二色性实验站（3）二维光电子衍射实验站。（3）后面可以安装另一种仪器，例如自旋偏振光发射或光电子发射显微镜。高分辨率的体敏光电发射在几百eV以上已经成为现实。在1 keV附近的光电发射分辨率优于100 meV。介绍了束线的现状和典型的研究活动。
Very high resolution and bright soft X-ray light is supplied with high stability and enough photon flux by the twin-helical undulator beam line BL25SU of SPring-8. Either helicity light with very high circular polarization is emitted on the same optical axis. The fundamental radiation can cover the hν region from 0.22 to 3keV, among which the hν region below 2keV is covered by a constant deviation angle monochromator with varied line spacing plane gratings (VLSPGM). The content of the higher order light is less than 1%. Accurate evaluation of the energy resolution of the VLSPGM is done by photoemission of the Fermi edge of Au. By using a grating with a central groove density of 600/mm, a resolution of better than 15,000 is realized at 870eV, whereas a resolution of better than 20,000 is realized by using a grating with 1000/mm central groove density. Three experimental stations for solid state spectroscopy are permanently set up in tandem on BL25SU: (1) high resolution photoemission (2) magnetic circular dichroism of core absorption (3) two dimensional photoelectron diffraction. Behind (3) can be installed another instrument such as a spin polarized photoemission or a photoelectron emission microscope. High resolution bulk sensitive photoemission has become a reality above several hundred eV. The photoemission resolution near 1keV is better than 100meV. The status of the beam line and typical research activities are reported.
影响因子：
64.8
作者：
A. Sekiyama;T. Iwasaki;K. Matsuda;Y. Saitoh;Y. Ōnuki;S. Suga
通讯作者：
A. Sekiyama;T. Iwasaki;K. Matsuda;Y. Saitoh;Y. Ōnuki;S. Suga