Ultralong-range energy transfer by interatomic Coulombic decay in an extreme quantum system
Ultralong-range energy transfer by interatomic Coulombic decay in an extreme quantum system
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DOI：
10.1038/nphys1685
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发表时间：
2010-07
期刊：
影响因子：
19.6
通讯作者：
N. Sisourat;N. Kryzhevoi;P. Kolorenč;S. Scheit;T. Jahnke;L. Cederbaum
中科院分区：
文献类型：
--
作者：
N. Sisourat;N. Kryzhevoi;P. Kolorenč;S. Scheit;T. Jahnke;L. Cederbaum
当一个原子被电子激发时，它通过发射一个光子或一个电子而弛豫，这些光子或电子携带着关于其发射体电子结构的重要信息。然而，如果一个原子被嵌入到化学环境中，另一个超快的非辐射衰变过程称为原子间库仑衰变（ICD）可能会起作用。由于ICD仅在邻居存在的情况下发生，因此它对该环境高度敏感。因此，它有可能成为一个强大的光谱方法来探测系统的封闭环境。在货车德瓦耳斯团簇、、以及氢键系统中，实验上已经观察到了ICD。ICD的一个关键特征是激发的原子可以将其多余的能量转移到远距离的邻居。巨大的极弱束缚氦二聚体是研究两个原子能交换能量多远的理想候选者。我们在这里报告说，二聚体中的两个氦原子可以通过ICD交换能量超过45倍的原子半径的距离。此外，我们表明，ICD光谱可用于成像振动波函数的电离激发氦二聚体。
When an atom is electronically excited, it relaxes by emitting a photon or an electron. These carry essential information on the electronic structure of their emitter. However, if an atom is embedded in a chemical environment, another ultrafast non-radiative decay process called interatomic Coulombic decay (ICD) can become operative. As ICD occurs only in the presence of neighbours, it is highly sensitive to that environment. Therefore, it has the potential to become a powerful spectroscopic method to probe the close environment of a system. ICD has been observed experimentally in van der Waals clusters,,,as well as in hydrogen-bonded systems,,. A key feature of ICD is that the excited atom can transfer its excess energy to its neighbours over large distances. The giant extremely weakly bound helium dimer is a perfect candidate to investigate how far two atoms can exchange energy. We report here that the two helium atoms within the dimer can exchange energy by ICD over distances of more than 45 times their atomic radius. Moreover, we demonstrate that ICD spectroscopy can be used for imaging vibrational wavefunctions of the ionized–excited helium dimer.