Nonexponentialities in the Ultrafast Electron-Transfer Dynamics in the System Oxazine 1 in N,N-Dimethylaniline
Nonexponentialities in the Ultrafast Electron-Transfer Dynamics in the System Oxazine 1 in N,N-Dimethylaniline
复制标题
N,N-二甲基苯胺中恶嗪 1 系统超快电子转移动力学的非指数
DOI：
10.1021/jp9843712
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发表时间：
1999
影响因子：
2.9
通讯作者：
W. Zinth
中科院分区：
文献类型：
--
作者：
S. Engleitner;M. Seel;W. Zinth
在光谱的蓝色部分（440 - 500 nm）进行探测的瞬态吸收实验是针对电子转移系统恶嗪1在N，N-二甲基苯胺中进行的。高时间分辨率优于20 fs的实验表明，由于高频波包运动（600 cm-1）在电子转移前的恶嗪1分子的激发电子态的显着调制。此外，调制由于波包运动的产物状态的恶嗪1后，完全电荷分离观察。与从N，N-二甲基苯胺到恶嗪1的电子转移相关的吸收瞬变明显是非单指数的，时间常数为30和80 fs。这种行为表明，电子转移反应具有很强的绝热性，与核运动具有很高的相关性。
Transient absorption experiments with probing in the blue part of the spectrum (440−500 nm) are performed for the electron-transfer system oxazine 1 in N,N-dimethylaniline. The experiments with high time resolution of better than 20 fs show pronounced modulations due to high-frequency wave packet motion (600 cm -1) in the excited electronic state of the oxazine 1 molecule before electron transfer. Additionally, modulations due to wave packet motion in the product state of oxazine 1 after complete charge separation are observed. The absorption transients related to the electron transfer from N,N-dimethylaniline to oxazine 1 are clearly nonmonoexponential with time constants of 30 and 80 fs. This behavior points to a strong adiabaticity of the electron-transfer reaction with a high relevance of nuclear motions.