Resonant tunneling through the repulsive Coulomb barrier of a quadruply charged molecular anion
Resonant tunneling through the repulsive Coulomb barrier of a quadruply charged molecular anion
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穿过四电荷分子阴离子的排斥库仑势垒的共振隧道
DOI：
10.1103/physreva.85.064503
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发表时间：
2012-06-25
影响因子：
2.9
通讯作者：
Wang, Lai-Sheng
中科院分区：
文献类型：
--
作者：
Phuong Diem Dau;Liu, Hong-Tao;Wang, Lai-Sheng
多电荷阴离子具有排斥库仑势垒（RCB），以防止电子发射，从而允许长寿命的亚稳态物质与负电子结合能。对于典型的多阴离子，bisdisulizole四阴离子，我们证明了电子激发态支持的RCB可以进行共振隧穿。通过单光子光电子成像和飞秒泵浦-探测光电子能谱研究了这一过程的动力学，并通过理论计算得到了证实。有效的共振隧穿发射的电子从多阴离子的激发态可能是常见的系统具有足够大的RCB。这可能为研究复杂系统中的电子发射动力学提供新的机会。
Multiply charged anions possess a repulsive Coulomb barrier (RCB) against electron emission, thus allowing for long-lived metastable species with negative electron binding energies. For the prototypical multianion, bisdisulizole tetra-anion, we demonstrate that electronically excited states supported by the RCB can undergo resonant tunneling. The dynamics of this process was investigated by one-photon photoelectron imaging and femtosecond pump-probe photoelectron spectroscopy and confirmed by theoretical calculations. Efficient resonant tunneling emission of electrons from the excited states of multianions may be common for systems with sufficiently large RCB. This may provide new opportunities to study electron emission dynamics in complex systems.