Delay in Photoemission
Delay in Photoemission
复制标题
DOI：
10.1126/science.1189401
复制
发表时间：
2010-06-25
期刊：
影响因子：
56.9
通讯作者：
Yakovlev, V. S.
中科院分区：
文献类型：
--
作者：
Schultze, M.;Fiess, M.;Yakovlev, V. S.
来自原子的光电发射被假定为响应于入射辐射而立即发生，并且为在计时原子尺度电子运动中设置时间零点提供了基础。我们使用阿秒计量揭示了从氖原子的2 p轨道释放的电子相对于由相同的100电子伏光脉冲从2s轨道释放的电子的发射延迟21 +/- 5阿秒。来自不同量子态的光电发射的时间上的微小差异为模拟多电子动力学提供了一个探针。阿秒计时计量学的帮助下完善的理论模型可以提供洞察电子的相关性，并允许设置的时间零点在原子尺度的计时精度为几阿秒。
Photoemission from atoms is assumed to occur instantly in response to incident radiation and provides the basis for setting the zero of time in clocking atomic-scale electron motion. We used attosecond metrology to reveal a delay of 21 +/- 5 attoseconds in the emission of electrons liberated from the 2p orbitals of neon atoms with respect to those released from the 2s orbital by the same 100-electron volt light pulse. Small differences in the timing of photoemission from different quantum states provide a probe for modeling many-electron dynamics. Theoretical models refined with the help of attosecond timing metrology may provide insight into electron correlations and allow the setting of the zero of time in atomic-scale chronoscopy with a precision of a few attoseconds.