Mechanism and Experimental Observability of Global Switching Between Reactive and Nonreactive Coordinates at High Total Energies
Mechanism and Experimental Observability of Global Switching Between Reactive and Nonreactive Coordinates at High Total Energies
复制标题
高总能量反应性和非反应性坐标之间全局切换的机制和实验可观测性
DOI：
10.1103/physrevlett.115.093003
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发表时间：
2015
影响因子：
8.6
通讯作者：
T. Komatsuzaki
中科院分区：
文献类型：
--
作者：
H. Teramoto;M. Toda;H. Kono;M.Takahashi;T. Komatsuzaki
我们提出了一种全局反应坐标切换的机制，即随着系统总能量的增加，反应坐标动态切换到另一个坐标的现象。该机制基于基础相空间几何形状的全局变化，该变化是由自由度超过 2 的系统中主要不稳定模式从原始反应模式切换到另一种非反应模式引起的。我们展示了一种实验可观测性，可以检测交叉电场和磁场中氢原子电离反应中的反应坐标转换。对于该反应，反应坐标是电子逃逸的坐标，其转换将逃逸方向从电场方向改变为磁场方向，因此，可以通过测量逃逸电子的角分辨动量分布来通过实验检测该转换。
We present a mechanism of global reaction coordinate switching, namely, a phenomenon in which the reaction coordinate dynamically switches to another coordinate as the total energy of the system increases. The mechanism is based on global changes in the underlying phase space geometry caused by a switching of dominant unstable modes from the original reactive mode to another nonreactive mode in systems with more than 2 degrees of freedom. We demonstrate an experimental observability to detect a reaction coordinate switching in an ionization reaction of a hydrogen atom in crossed electric and magnetic fields. For this reaction, the reaction coordinate is a coordinate along which electrons escape and its switching changes the escaping direction from the direction of the electric field to that of the magnetic field and, thus, the switching can be detected experimentally by measuring the angle-resolved momentum distribution of escaping electrons.