A development of site-selective, valence-selective, and spin-selective XAFS spectroscopy by inelastic x-ray scattering

通过非弹性 X 射线散射开发位点选择性、价态选择性和自旋选择性 XAFS 光谱

• 批准号: 15205002
• 负责人: UDAGAWA Yasuo
• 金额: $ 27.29万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15205002/
• 关键词: Inelastic x-ray scattering; X-ray Raman scattering; XAFS; XANES; spin-selective XAFS; valence-selective XAFS; スピン分解XAFS

Thanks to the present grant, we have constructed a high-sensitive x-ray spectrometer, developed a method to obtain lifetime-broadening-free XANES spectra, and carried out the following spectroscopic studies.1. Construction of an x-ray spectrometer equipped with a two-dimensional detector and five dispersing analyzer crystal.2. We have succeeded in obtaining weak XANES spectra excited under pre-resonantt conditions owing to the high-sensitive spectrometer described above. Subsequently, we have shown that lifetime-broadening-free XANES spectra can be obtained by numerically analyzing those spectra by an equation based on Kramers-Heisenberg equation.3. Based on 1 and 2, we have carried out the following studies.(1) Observation of spin-selective XANES spectra of MnO and other manganese compounds.(2) Studies on orbital- and spin-ordering of LaMnO3 by spin-selective, polarization XANES spectra.(3) Observation of 2p-4f quadrupole transitions of Dy and Ho compounds.(4) Valence-selective XANES study of mixed valence (Ge^<3+>(Ge^+Cl^-_4)) compound GeCl_2.

多亏了这笔资金，我们建造了一台高灵敏度的X射线光谱仪，开发了一种获得无寿命展宽XANES光谱的方法，并开展了以下光谱研究1。研制了一台具有二维探测器和五个色散分析器晶体的X射线能谱仪。由于上述高灵敏度的光谱仪，我们成功地获得了在预共振条件下激发的微弱XANES光谱。随后，我们证明了基于Kramers-Heisenberg方程的XANES谱可以通过数值分析得到无寿命展宽的XANES谱。在文献1和2的基础上，我们进行了以下研究：(1)观察了MnO和其他锰化合物的自旋选择XANES谱，(2)用自旋选择XANES谱研究了LaMnO_3的轨道和自旋有序性，(3)Dy和Ho化合物的2p-4f四极跃迁，(4)混合价态(Ge^&lt；3+&Gt；(Ge^+Cl^-4))化合物GeCl2的价选择XANES研究。

项目成果

Lifetime-Broadening-Removed XANES Spectroscopy by High-Resolution Resonant Inelastic X-Ray Scattering

通过高分辨率共振非弹性 X 射线散射进行寿命加宽消除 XANES 光谱分析

• 发表时间: 2005
• 期刊: Physica Scripta, T115
• 作者: Shimizu;R.;Ogasawara;Y.;Hiroyuki Shibusawa;Hisashi Hayashi
• 通讯作者: Hisashi Hayashi

Lifetime broadening free, valence selective XAFS of Ga compounds

Ga 化合物的无寿命展宽、价态选择性 XAFS

• 期刊: Advances in X-ray Chemical Analysis (in press)
• 作者: K.Giese;H.Ushiyama;K.Takatsuka;O.Kuehn;Hisashi Hayashi
• 通讯作者: Hisashi Hayashi

Lifetime-broadening-suppressed/free XANES spectroscopy by high-resolution resonant inelastic x-ray scattering

• DOI: 10.1103/physrevb.68.045122
• 发表时间: 2003-07
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: H. Hayashi;R. Takeda;Y. Udagawa;Tetsuya Nakamura;H. Miyagawa;H. Shoji;S. Nanao;N. Kawamura

Selective XANES spectroscopy from RIXS contour map

RIXS 等值线图的选择性 XANES 光谱

• 发表时间: 2005
• 期刊: J.Phys.Chem.Solids 66
• 作者: Matsumoto;D.;F.Masuda;Kazuo Takatsuka;H.Hayashi
• 通讯作者: H.Hayashi

X線非弾性散乱の現在

非弹性X射线散射研究现状

• 发表时间: 2004
• 期刊: 分光研究 53
• 作者: N.Matubayasi;M.Nakahara;林久史
• 通讯作者: 林久史