Vibrational Feshbach Resonances Mediated by Nondipole Positron-Molecule Interactions

M. R. Natisin, J. R. Danielson, G. F. Gribakin, A. R. Swann, C. M. Surko

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Measurements of energy-resolved positron-molecule annihilation show the existence of positron binding andvibrational Feshbach resonances. The existing theory describes this phenomenon successfully for the case ofinfrared-active vibrational modes which allow dipole coupling between the incident positron and the vibrationalmotion. Presented here are measurements of positron-molecule annihilation made using a recently developedcryogenic positron beam capable of significantly improved energy resolution. The results provide evidence ofresonances associated with infrared-inactive vibrational modes, indicating that positron-molecule bound statesmay be populated by nondipole interactions. The anticipated ingredients for a theoretical description of suchinteractions are discussed.
Original languageEnglish
Article number113402
JournalPhysical Review Letters
Publication statusPublished - 15 Sep 2017


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