Multi-dimensional wave-packet dynamics in potoinduced phase transition materials

马铃薯诱导相变材料中的多维波包动力学

基本信息

批准号：
18340079
负责人：
SUEMOTO Tohru
金额：
$ 10.33万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18340079/
关键词：
photoinduced phase transition wave packet Lissajous motion femtosecond time resolved luminescence halogen bridged platinum comples halogen bridged palladium complex F-center 発光白金錯体パラジウム錯体シトクロムc ダイナミクス

项目摘要

<Transition metal complexes> We investigated time resolved luminescence in Pt-Br at low temperature. We have found that the luminescence intensity increases anomalously at the low energy end of the wave packet (WP) oscillation. When the main part of the WP turns back to the high energy end, some part goes opposite direction. By comparing the results with a model calculation, we concluded that the WP splits on the top of the adiabatic potential curve connecting the self-trapped-exciton (STE) and the soliton pair state.We investigated the time resolved luminescence of Pd-Br complexes. We found that the STE state does not exist in this material, in spite of the charge-density-wave (CDW) ground state. The WP propagates to the state lower than the band gap without oscillation. This reflects the WP dynamics representing the phase transformation from Peierls insulator to Mott insulator.<F-centers in alkali halides> We observed the WP dynamics in F-centers. We found an asymmetric spectrum and unequal decay dynamics at high and low energy sides of the luminescence peak. This seems to originate from the large anharmonicity due to anticrossing between the 2s and 2p states. This is a good example of the WP dynamics on the potential curve with a crossing, which will useful for understanding the dynamics of photoinduced phase transitions.<Bio-materials> We observed the untrafast luminescence in aqueous solution of cytochrome c for the first time and assigned a luminescence peak to Q band. The result indicates that the non-radiative transfer of the electron to the d-orbital of Fe ion occurs within 300 fs. A long lifetime component is found and assigned to the state with a dessociated methionine group. These results clarify the relaxation dynamics of cytochrome c, which has not been known due to low luminescence intensity.

<过渡金属配合物> 我们研究了 Pt-Br 在低温下的时间分辨发光。我们发现，在波包（WP）振荡的低能量端，发光强度异常增加。当WP的主要部分返回到高能量端时，某些部分会向相反的方向移动。通过将结果与模型计算进行比较，我们得出结论，WP 在连接自陷激子 (STE) 和孤子对态的绝热势曲线的顶部分裂。我们研究了 Pd-Br 配合物的时间分辨发光。我们发现，尽管存在电荷密度波 (CDW) 基态，但该材料中不存在 STE 态。 WP 传播到低于带隙的状态而不发生振荡。这反映了代表从 Peierls 绝缘体到莫特绝缘体的相变的 WP 动力学。<碱金属卤化物中的 F 中心> 我们观察了 F 中心的 WP 动力学。我们发现发光峰的高能侧和低能侧存在不对称光谱和不相等的衰减动力学。这似乎源于 2s 和 2p 态之间的反交叉导致的大的不和谐性。这是具有交叉点的电位曲线上的WP动力学的一个很好的例子，这对于理解光诱导相变的动力学很有用。<生物材料>我们首次观察到细胞色素c水溶液中的超快发光，并且将发光峰分配给 Q 带。结果表明，电子非辐射转移到Fe离子的d轨道在300 fs内发生。找到长寿命组分并将其分配给具有解离的甲硫氨酸基团的状态。这些结果阐明了细胞色素 c 的弛豫动力学，该动力学由于发光强度低而尚不清楚。