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

我们研究了Pt-Br在低温下的时间分辨发光。我们发现，在波包振荡的低能端，发光强度异常增大。当WP的主体部分转回高能端时，部分方向相反。通过与模型计算结果的比较，我们得出结论，WP在连接自困激子（STE）和孤子对状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。我们发现在这种材料中不存在STE态，尽管有电荷密度波（CDW）基态。WP在不振荡的情况下传播到低于带隙的状态。这反映了代表从佩尔斯绝缘子到莫特绝缘子相变的WP动力学。<碱化物中的f中心>我们观察了f中心的WP动态。在发光峰的高低能侧发现了不对称的光谱和不均匀的衰减动力学。这似乎是由于2s态和2p态之间的反交叉引起的大的非调和性。这是具有交叉的势曲线上的WP动力学的一个很好的例子，这将有助于理解光诱导相变的动力学。<生物材料>我们首次在细胞色素c水溶液中观察到非快速发光，并将发光峰分配到Q波段。结果表明，电子向铁离子d轨道的非辐射转移发生在300 fs以内。找到一个长寿命的组分，并将其分配给具有解耦蛋氨酸基团的状态。这些结果阐明了细胞色素c的松弛动力学，这是由于低发光强度而不为人所知的。

<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.