Volume 06, No.5
September issue 2001
1. SPring-8の現状／PRESENT STATUS OF SPring-8
（財）高輝度光科学研究センター SPring-8利用研究課題選定委員会、姫路工業大学 理学部 Faculty of Science, Himeji Institute of Technology
2. 共用ビームライン／PUBLIC BEAMLINE
[1]（財）高輝度光科学研究センター 放射光研究所 利用研究促進部門Ⅰ JASRI Materials Science Division、[2]（財）高輝度光科学研究センター 放射光研究所 利用研究促進部門Ⅱ JASRI Life & Environment Division、[3]（財）高輝度光科学研究センター 放射光研究所 ビームライン・技術部門 JASRI Beamline Division
日本原子力研究所、理化学研究所、放射光利用研究促進機構 （財）高輝度光科学研究センター JAERI／RIKEN／Organization for the Promotion of Synchrotron Radiation Research · JASRI
3. その他のビームライン／OTHER BEAMLINES
[1]理化学研究所 播磨研究所 RIKEN Harima Institute、[2]（財）高輝度光科学研究センター JASRI
4. 最近の研究から／FROM LATEST RESEARCH
奈良先端科学技術大学院大学 物質創成科学研究科 Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST)
- Abstract
- A new display-type spherical mirror analyzer has been constructed at BL25SU to study photoelectron spectroscopy especially for circularly polarized light photoelectron diffraction. The advantage of this analyzer is that the angular distribution of emitted photoelectrons of one particular kinetic energy can be measured on the screen without distortion. The energy resolution is 0.3% of the pass energy. The acceptance solid angle is ±60 deg at present, and it can be increased to ±80 deg in near future. The angular resolution is 0.6 deg. Recent result of stereo-photograph of atomic arrangement is shown.
[1]松下電器産業㈱ 先端技術研究所、科学技術振興事業団 ERATO プロトニックナノマシンプロジェクト Advanced Technology Research Laboratories, Matsushita E. I. Co., Ltd.／Protonic NanoMachine Project, ERATO, JST、[2]科学技術振興事業団 ERATO プロトニックナノマシンプロジェクト Protonic NanoMachine Project, ERATO, JST
- Abstract
- The bacterial flagellar filament is a helical propeller made of 11 protofilaments of a single protein, flagellin. The filament switches between left- and right-handed supercoiled forms when bacteria switch the swimming mode between running and tumbling. Supercoiling is produced by two different packing interactions of flagellin called L and R. In switching from L to R, the intersubunit distance (~52 Å) along the protofilament decreases by 0.8 Å. We solved the 2.0 Å resolution crystal structure of a 41-kDa fragment of Salmonella flagellin. The crystal contained pairs of antiparallel straight protofilaments having the R-type repeat. By simulated extension of the protofilament model, we identified possible switch regions responsible for the bi-stable mechanical switch.
[1]姫路工業大学 理学部 Himeji Institute of Technology, Faculty of Science、[2]（財）高輝度光科学研究センター JASRI 、[3]東北大学大学院 理学研究科 Graduate School of Science, Tohoku University
- Abstract
- We have distinctively determined the orbital populations of two eg-type (x2-y2 and 3z2-r2) state in the bilayer manganite La2-2xSr1+2xMn2O7 by magnetic Compton profile (MCP) measurement. MCP's were measured along the [001] direction at x=0.35 and 0.42, and fitted by the theoretical profiles obtained from the (MnO6) 8− ab initio calculations. From the fitting analysis, it is found that the MCP clearly detects the hybridization effect of Mn 3d and O 2p orbitals in the eg state. The eg orbital state is dominated by the x2-y2-type orbital, and its population is almost constant with increasing the hole concentration x, while that in the 3z2-r2-type orbital decreases.
[1]理化学研究所 播磨研究所 Ｘ線干渉光学研究室 Coherent X-ray Optics Laboratory, Harima Institute, RIKEN、[2]（財）高輝度光科学研究センター 放射光研究所 ビームライン・技術部門 JASRI Beamline Division、[3]理化学研究所 播磨研究所 Ｘ線干渉光学研究室、（財）高輝度光科学研究センター Coherent X-ray Optics Laboratory, Harima Institute, RIKEN／JASRI
5. 研究会等報告／WORKSHOP AND COMMITTEE REPORT
[1]第5回播磨国際フォーラム実行委員会、姫路工業大学 理学部 Faculty of Science, Himeji Institute of Technology、[2]（財）高輝度光科学研究センター 利用研究促進部門Ⅱ JASRI Life & Environment Division
