Time-resolved photoelectron imaging of the chloranil radical anion: ultrafast relaxation of electronically excited electron acceptor states
Time-resolved photoelectron imaging of the chloranil radical anion: ultrafast relaxation of electronically excited electron acceptor states
复制标题
DOI：
10.1039/c1cp22237f
复制
发表时间：
2011-01-01
影响因子：
3.3
通讯作者：
Verlet, Jan R. R.
中科院分区：
文献类型：
--
作者：
Horke, Daniel A.;Verlet, Jan R. R.
利用光电子成像技术研究了孤立的四氯苯醌自由基负离子近阈值激发态的光谱和动力学。在480 nm处拍摄的光电子图像清楚地表明通过束缚电子激发态的共振增强光剥离。时间分辨光电子成像显示，激发态通过内部转换在130 fs的时间尺度上迅速衰减。阈值附近的激发态的超快弛豫动力学是相关的常见的电子受体分子的醌部分的基础上，可以作为门口的状态，使有效的电子转移在高度放能反转制度，尽管存在大的自由能垒。
The spectroscopy and dynamics of near-threshold excited states of the isolated chloranil radical anion are investigated using photoelectron imaging. The photoelectron images taken at 480 nm clearly indicate resonance-enhanced photodetachment via a bound electronic excited state. Time-resolved photoelectron imaging reveals that the excited state rapidly decays on a timescale of 130 fs via internal conversion. The ultrafast relaxation dynamics of excited states near threshold are pertinent to common electron acceptor molecules based on the quinone moiety and may serve as doorway states that enable efficient electron transfer in the highly exergonic inverted regime, despite the presence of large free energy barriers.