基于FIREBALL局域轨道密度泛函理论的高效分子动力学模型研究光诱导反应
Photo-induced reactions from efficient molecular dynamics with electronic transitions using the FIREBALL local-orbital density functional theory formalism
摘要：
大分子体系中光诱导过程的计算机模拟是一个非常具有挑战性的问题。在这里，我们提出了一个详细的描述，我们实施的分子动力学与电子跃迁算法内的本地轨道密度泛函理论代码火球，适合于这些问题的计算研究。我们的方法能够模拟数百个轨迹的光诱导反应机制;因此，可以计算出大量统计上显著的集合，以准确地表示反应曲线。作为这种方法的应用的一个例子，我们报告的[2+2]环加成的乙烯与马来酸酐和[2+2]光诱导聚合反应的两个C60分子的结果。我们确定了不同的失活通道的初始电子激发，取决于从LUMO到HOMO的电子跃迁的时间，和过渡后的HOMO的字符。
英文摘要：
The computational simulation of photo-induced processes in large molecular systems is a very challenging problem. Here, we present a detailed description of our implementation of a molecular dynamics with electronic transitions algorithm within the local-orbital density functional theory code Fireball, suitable for the computational study of these problems. Our methodology enables simulating photo-induced reaction mechanisms over hundreds of trajectories; therefore, large statistically significant ensembles can be calculated to accurately represent a reaction profile. As an example of the application of this approach, we report results on the [2+2] cycloaddition of ethylene with maleic anhydride and on the [2+2] photo-induced polymerization reaction of two C60 molecules. We identify different deactivation channels of the initial electron excitation, depending on the time of the electronic transition from LUMO to HOMO, and the character of the HOMO after the transition.
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