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Dynamics of Molecules near Ionization

机译:接近电离的分子动力学

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摘要

In this paper, we report our experimental studies, using femtosecond-resolved mass spectrometry, and theoretical calculations of the potential energy surfaces, using density functional theory, for 10 aliphatic amines (substituted ammonia) excited directly near the ionization continuum. By probing parent and fragment masses, we are able to decipher pathways of the reactive α-cleavage and the nonreactive internal conversion, a precursor for the following chemistry. The bifurcation in these channels is related to the structure, as evidenced by the dramatic effect of α-substitution vs N-substitution on the time scale of the dynamics-femtosecond vs picosecond rates. For all molecules studied, the observed branching is dependent on the change of character of the state, ionic and/or neutral, along the reaction coordinate, and this change blurs the distinction between Rydberg and Superexcited states in their subsequent reactivity.
机译:在本文中,我们使用飞秒分辨质谱仪报告了我们的实验研究,并使用密度泛函理论对直接在电离连续体附近激发的10个脂肪族胺(取代的氨)的势能面进行了理论计算。通过探测母体和碎片的质量,我们能够破译反应性α裂解和非反应性内部转化的途径,这是以下化学反应的前身。这些通道中的分叉与结构有关,如α-取代vs-N取代对飞秒-皮秒速率的时间尺度的巨大影响所证明。对于所有研究的分子,观察到的支化取决于沿着反应坐标的离子,和/或中性状态的变化,并且这种变化模糊了里德堡和超激发态在其后续反应性之间的区别。

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