Electron transfer in a virtual quantum state of LiBH4 induced by strong optical fields and mapped by femtosecond x-ray diffraction.
Electron transfer in a virtual quantum state of LiBH4 induced by strong optical fields and mapped by femtosecond x-ray diffraction.
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由强光场诱导的 LiBH4 虚拟量子态中的电子转移，并通过飞秒 X 射线衍射绘制。
DOI：
10.1103/physrevlett.109.147402
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发表时间：
2012
影响因子：
8.6
通讯作者：
A. Borgschulte
中科院分区：
文献类型：
--
作者：
J. Stingl;F. Zamponi;B. Freyer;M. Woerner;T. Elsaesser;A. Borgschulte
与混合量子态中电子电荷的空间重新分布有关的瞬变极化是由高振幅光场引起的。用飞秒X射线粉末衍射法作为结构探针，首次测定了相关的暂态电子密度图。原型离子材料LiBH4在强的亚40fs光脉冲的非共振驱动下，在激发过程中表现出从BH4(-)阴离子到Li+阳离子的大幅度完全可逆的电子转移。我们的结果证实了这一机制是强光偏振的来源，这与理论估计是定量一致的。
Transient polarizations connected with a spatial redistribution of electronic charge in a mixed quantum state are induced by optical fields of high amplitude. We determine for the first time the related transient electron density maps, applying femtosecond x-ray powder diffraction as a structure probe. The prototype ionic material LiBH4 driven nonresonantly by an intense sub-40 fs optical pulse displays a large-amplitude fully reversible electron transfer from the BH4(-) anion to the Li+ cation during excitation. Our results establish this mechanism as the source of the strong optical polarization which agrees quantitatively with theoretical estimates.