Synchrotron-radiation X-ray structural analysis of photo-excited state

光激发态同步辐射X射线结构分析

• 批准号: 15104005
• 负责人: MORITOMO Yutaka
• 金额: $ 73.13万
• 依托单位: University of Tsukuba (2005-2007)Nagoya University (2003-2004)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (S)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15104005/
• 关键词: Photoinduced phase transition; Synchrotron-radiation X-ray; Transition metal comulex; MEM charge density; Electrostatic potential imaging; Time-resolved spectroscopy; Valence-control; Electronic phase diagram; 時間分解構造解析; 粉末X線構造解析; SPring-8; 時間分解

The purpose of this project is to search the photoinduced phenomena in transition metal complexes by means of the time-resolved spectroscopy, and to clarify to photoinduced effect vy the structural investigation with use of the 3rd generation synchrotron-radiation x-ray. We investigated the structure under photo-irradiation at the BL02B2 bending magnet beamline, and built a time-resolved x-ray diffraction apparatus at the BL40XU undulator beamline. The followings are the main results.(1) We have found a first-order phase transition of the dynamical steady state of [Fe (ptz)_6] (BF_4)_2 under photo-excitation We further investigated the temporal behavior to reach the steady state and clarified that the chemical pressure effect of the photo-created high-spin species play an important role in the dynamical phase transition.(2) WE realized the on/off switching od the spin state of [Fe (phen)_2] (NCS)_2. We further determined the MEM charge density of both the phases.(3) We investigated the photo-response of the spin system of LaMnO3 with layered-type antiferromagnic structure, and found that the critical slowing-down behavior disappears.(4) We have built the time-resolved diffraction apparatus at the BL40XU undulator beamline(5) The have determined the MEM charge density of highly photon sensitive RbMn[Fe (CN)_6]. We further clarified the valence state of by means of the electrostatic potential imaging.(6) We have synthesized the valence-controlled Co-Fe cyano-bridged transition metal films, and determined the electronic phase diagram.(7) BY means of the femto-second time-resolved spectroscopy, we have found a lifetime elongation behavior of the Co-Fe cyanide

本计画的目的是利用时间分辨光谱研究过渡金属配合物中的光致现象，并利用第三代同步辐射x射线研究配合物的结构以阐明光致效应。我们在BL02B2偏转磁铁束线上研究了光辐照下的结构，并在BL40XU波荡器束线上建立了时间分辨X射线衍射装置。主要结果如下。(1)我们发现[Fe（ptz）_6]（BF_4）_2在光激发下的动力学稳定态存在一级相变，并进一步研究了达到稳定态的时间行为，阐明了光生高自旋物种的化学压力效应在动力学相变中的重要作用。(2)我们实现了[Fe（phen）_2]（NCS）_2自旋态的开关。我们进一步确定了两个相的MEM电荷密度。(3)我们研究了具有层状反铁磁结构的LaMnO_3自旋系统的光响应，发现临界慢化行为消失。(4)在BL 40XU波荡器光束线上建立了时间分辨衍射装置。（5）测定了高光子灵敏度RbMn[Fe（CN）_6]的MEM电荷密度。通过静电势成像进一步明确了化合物的价态。(6)合成了价态可控的钴铁氰基桥联过渡金属薄膜，并测定了其电子相图。(7)利用飞秒时间分辨光谱，我们发现了钴铁氰化物的寿命延长行为

项目成果

Electronic structure and photoinduced effect of LaMnO3 film

• DOI: 10.1103/physrevb.73.180403
• 发表时间: 2006-05
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: K. Murakami;T. Yamauchi;A. Nakamura;Y. Moritomo;Hidekazu Tanaka;T. Kawai

Visible-light-indueed reversible photomagnetism in rubidium mangnanese hexacyan oferrate

可见光诱导的六氰基高铁酸铷锰的可逆光磁性

• 发表时间: 2008
• 期刊: Chem. Matt 20
• 作者: H.;Tokoro;et. al.
• 通讯作者: et. al.

Visible-light-induced reversible photomagnetism in rubidium mangnanese hexacyanoferrate

六氰基铁酸锰铷中可见光诱导的可逆光磁性

• 发表时间: 2008
• 期刊: Chem. Matt. 20
• 作者: H. Tokoro;T. Motsuda;T. Nuida;Y. Moritomo;K. Ohoyama;E. d. Loutete;K. Boukheddaden and S. Ohkoshi
• 通讯作者: K. Boukheddaden and S. Ohkoshi

Charge-transfer transition in two-dimensional Cs[Co(3-cyanopyridine)2][W(CN8)H20 as investigated by angle-resolved x-ray diff

通过角度分辨 X 射线衍射研究二维 Cs[Co(3-氰基吡啶)2][W(CN8)H20 中的电荷转移跃迁

• 发表时间: 2007
• 期刊: Phys. Rev. B 76
• 作者: J. E. Kim;et. al.
• 通讯作者: et. al.

Cooperative formation of high-spin species in a photoexcited spin-cors sover complex

光激发自旋-科尔索复合体中高自旋物种的协同形成

• 发表时间: 2006
• 期刊: Phys. Rev. B 73
• 作者: Y.;Moritomo、 ;et. al.
• 通讯作者: et. al.