Resonant Annihilation and Positron Bound States in Benzene
Resonant Annihilation and Positron Bound States in Benzene
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苯中的共振湮灭和正电子束缚态
DOI：
10.1103/physrevlett.129.123401
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发表时间：
2022
影响因子：
8.6
通讯作者：
Surko, C. M.
中科院分区：
文献类型：
--
作者：
Ghosh, S.;Danielson, J. R.;Surko, C. M.
正电子在振动共振的两体碰撞中附着在分子上，从而大大提高了湮灭率。测量湮没作为正电子能量的函数，苯使用低温，陷阱为基础的光束。他们建立了的正电子结合能来测试最先进的理论计算，并且他们表现出许多意想不到的共振，这可能是由于组合和泛音振动模式造成的。讨论了这些结果与苯的唯一键结构的关系。
Positrons attach to molecules in vibrationally resonant two-body collisions that result in greatly enhanced annihilation rates. Measurements of annihilation as a function of positron energy are presented for benzene using a cryogenic, trap-based beam. They establish a positron binding energy ofto test state-of-the-art theoretical calculations, and they exhibit many unexpected resonances, likely due to combination and overtone vibrational modes. The relationship of these results to the unique-bonded structure of benzene is discussed.