Vibrational Feshbach Resonances Mediated by Nondipole Positron-Molecule Interactions
Vibrational Feshbach Resonances Mediated by Nondipole Positron-Molecule Interactions
复制标题
非偶极正电子分子相互作用介导的振动费什巴赫共振
DOI：
10.1103/physrevlett.119.113402
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发表时间：
2017
影响因子：
8.6
通讯作者：
Surko, C. M.
中科院分区：
文献类型：
--
作者：
Natisin, M. R.;Danielson, J. R.;Gribakin, G. F.;Swann, A. R.;Surko, C. M.
能量分辨的正电子-分子湮灭的测量表明正电子结合和振动Feshbach共振的存在。现有的理论成功地描述了这种现象的情况下，红外活性的振动模式，允许偶极耦合的入射正电子和振动运动。这里提出的测量正电子分子湮灭使用最近开发的低温正电子束能够显着提高能量分辨率。结果提供了与红外非活性振动模式相关的共振的证据，表明正电子分子束缚态可能由非偶极相互作用占据。这种相互作用的理论描述的预期成分进行了讨论。
Measurements of energy-resolved positron-molecule annihilation show the existence of positron binding and vibrational Feshbach resonances. The existing theory describes this phenomenon successfully for the case of infrared-active vibrational modes that allow dipole coupling between the incident positron and the vibrational motion. Presented here are measurements of positron-molecule annihilation made using a recently developed cryogenic positron beam capable of significantly improved energy resolution. The results provide evidence of resonances associated with infrared-inactive vibrational modes, indicating that positron-molecule bound states may be populated by nondipole interactions. The anticipated ingredients for a theoretical description of such interactions are discussed.