Virtual-state formation in positron scattering from vibrating molecules: a gateway to annihilation enhancement.
Virtual-state formation in positron scattering from vibrating molecules: a gateway to annihilation enhancement.
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振动分子正电子散射的虚态形成：增强湮灭的途径。
DOI：
10.1103/physrevlett.90.183201
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发表时间：
2003
影响因子：
8.6
通讯作者：
F. Gianturco
中科院分区：
文献类型：
--
作者：
T. Nishimura;F. Gianturco
在本信中，计算证据首次提供，选择多原子CH 4和C2H2分子作为例子，虚态的存在所造成的动态耦合分子振动与正电子运动在低能散射过程中。我们的计算提供了比振动周期更长的寿命，这表明中间的“化合物”配置可能是网关，通过该网关，近热正电子在分子气体中的湮灭率可以变得比从简单的动力学预期的大几个数量级，正如它确实是实验观察到的。
In the present Letter, computational evidence is provided for the first time, choosing the polyatomic CH4 and C2H2 molecules as examples, of the existence of virtual states caused by dynamically coupling molecular vibrations with the positron motion during low-energy scattering processes. Our calculations provide lifetimes longer than vibrational periods, suggesting that the intermediate "compound" configurations could be the gateways through which the rate of annihilation of near-thermal positrons in molecular gases can become orders of magnitude larger than expected from the simpler dynamics, and as it is indeed observed experimentally.