FUTURE-PROSPECTS OF XAFS RESEARCHES USING HIGH BRILLIANCE PHOTON SOURCES

被引:11
作者
OYANAGI, H
机构
[1] Electrotechnical Laboratory, Tsukuba, 305, Umezono
来源
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS | 1993年 / 32卷
关键词
XAFS; MULTIPOLE WIGGLER; INSERTION DEVICE; QUICK SCAN; HIGH BRILLIANCE; TUNABLE UNDULATOR;
D O I
10.7567/JJAPS.32S2.861
中图分类号
O59 [应用物理学];
学科分类号
摘要
Future prospects in XAFS researches to be developed by high brilliance photon sources are discussed. Above a dilute limit, sensitivity and time resolution am enhanced with the increase in brilliance, detector effeciency and focusing capability. It is shown that a multipole wiggler and multi-element solid state detector improve both sensitivity and time resolution by an order of magnitude. Applications to structural studies of dilute systems. in particular, surface and interfaces are presented. A ''tunable'' X-ray undulator inserted in an ultra-low (<10 nrad) emittance storage ring, which covers a hard X-ray (4-30 keV) region using the fundamental and third higher harmonic radiations, further improves the present limitations on sensitivity and resolutions in time, space and energy. Feasibility of a variable gap/bandpath undulator combined with new quick scanning techniques for applications in time-resolved studies is discussed. By optimizing an undulator band width for a scan, without varying undulator gap, XAFS is obtained by simple scanning of monochromator (Q-scan I). A new quick scanning technique for time-resolved studies on dilute systems based on an energy dispersive geometry (Q-scan II) is proposed. Design considerations of a ''tunable'' X-ray undulator XAFS beamline at SPring-8 are presented, in which either a high flux or a microfocus high energy resolution beam is obtained by a fixed-exit double-axis (2+2) crystal monochromator followed by crossed eliptical mirrors. A concept of ''ring'' detector for microfucusing in a fluorescence detection mode is also proposed.
引用
收藏
页码:861 / 865
页数:5
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