Strong geometric-phase effects in the hydrogen-exchange reaction at high collision energies: II. Quasiclassical trajectory analysis

Strong geometric-phase effects in the hydrogen-exchange reaction at high collision energies: II. Quasiclassical trajectory analysis
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高碰撞能量下氢交换反应中的强几何相效应:II。

DOI:
10.1080/00268971003610218
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发表时间:
2010
期刊:
影响因子:
1.7
通讯作者:
Bouakline F
Bouakline F
中科院分区:
化学4区
文献类型:
--
作者:
Bouakline F

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关于氢交换反应的最新计算[Bouakline等人,J.Chem.Phys.128,124322(2008)]已经发现,在能量高于圆锥相交(CI)接缝的能量最小值时,在状态-状态微分截面(DCS)中存在强的几何相位(GP)效应,其在积分截面(ICS)中抵消。在这篇文章中,我们解释了这种取消的起源,并通过准经典轨道(QCT)计算对这些高能量下的反应机制的性质进行了其他预测。详细的比较与量子的结果分裂的量子和QCT横截面的贡献,从反应路径的风在不同的意义上的CI和分散的产品在近侧和远侧的方向。穿过一个过渡态(1-TS)的反应路径仅在近侧方向上散射它们的产物,而穿过两个过渡态(2-TS)的反应路径在近侧和远侧方向上都散射。然而,近侧2-TS产品散射到角相空间的不同区域比1-TS产品,这解释了为什么GP效应在ICS中抵消。QCT结果的分析还表明,两个独立的反应机制可能是负责在高能量的2-TS散射。
Recent calculations on the hydrogen-exchange reaction [Bouaklineet al., J. Chem. Phys.128, 124322 (2008)], have found strong geometric phase (GP) effects in the state-to-state differential cross-sections (DCS), at energies above the energetic minimum of the conical intersection (CI) seam, which cancel out in the integral cross-sections (ICS). In this article, we explain the origin of this cancellation and make other predictions about the nature of the reaction mechanisms at these high energies by carrying out quasiclassical trajectory (QCT) calculations. Detailed comparisons are made with the quantum results by splitting the quantum and the QCT cross-sections into contributions from reaction paths that wind in different senses around the CI and that scatter the products in the nearside and farside directions. Reaction paths that traverse one transition state (1-TS) scatter their products in just the nearside direction, whereas paths that traverse two transition states (2-TS) scatter in both the nearside and farside directions. However, the nearside 2-TS products scatter into a different region of angular phase-space than the 1-TS products, which explains why the GP effects cancel out in the ICS. Analysis of the QCT results also suggests that two separate reaction mechanisms may be responsible for the 2-TS scattering at high energies.
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