Ultrafast evolution of imidazole after electronic excitation.
Ultrafast evolution of imidazole after electronic excitation.
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电子激发后咪唑的超快演化。
DOI：
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发表时间：
2012
影响因子：
2.9
通讯作者：
A. Longarte
中科院分区：
文献类型：
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作者：
R. Montero;A. Peralta Conde;V. Ovejas;M. Fernández;F. Castaño;A. Longarte
咪唑生色团的超快动力学已被跟踪电子激发后，在250-217 nm的能量范围内，通过时间延迟电离与800 nm的激光脉冲。在咪唑（+）质量通道收集的时间相关信号显示了飞秒动力学的特征，起源于位于探索能量区域的πσ* 和ππ* 型态。瞬态的拟合，由于非共振相干绝热激发的出现，需要基于布洛赫方程的量子处理，产生两个寿命18 ± 4和19 ± 4 fs。第一个与πσ*<$ππ* 内转换有关，而第二个反映了系统沿着解离πσ* 表面演化时电离截面的损失。这项研究提供了一个全面的图片的分子，同意与以前的实验和理论研究结果。
The ultrafast dynamics of the imidazole chromophore has been tracked after electronic excitation in the 250-217 nm energy region, by time delayed ionization with 800 nm laser pulses. The time-dependent signals collected at the imidazole(+) mass channel show the signature of femtosecond dynamics, originating on the πσ*- and ππ*-type states located in the explored energy region. The fitting of the transients, which due to the appearance of nonresonant coherent adiabatic excitation requires a quantum treatment based in the Bloch equations, yields two lifetimes of 18 ± 4 and 19 ± 4 fs. The first is associated with the πσ* ← ππ* internal conversion, while the second reflects the loss of ionization cross-section as the system evolves along the dissociative πσ* surface. This study provides a comprehensive picture of the photophysics of the molecule that agrees with previous experimental and theoretical findings.
影响因子：
5.7
作者：
Roberts, Gareth M.;Chatterley, Adam S.;Stavros, Vasilios G.
通讯作者：
Stavros, Vasilios G.