Department of Physics, University of California, San Diego, La Jolla, California 92093, USA.
Phys Rev Lett. 2013 May 31;110(22):223201. doi: 10.1103/PhysRevLett.110.223201. Epub 2013 May 29.
Vibrational Feshbach resonances are dominant features of positron annihilation for incident positron energies in the range of the molecular vibrations. Studies in relatively small molecules are described that elucidate the role of intramolecular vibrational energy redistribution into near-resonant multimode states, and the subsequent coupling of these modes to the positron continuum, in suppressing or enhancing these resonances. The implications for annihilation in other molecular species, and the necessary ingredients of a more complete theory of resonant positron annihilation, are discussed.
振动 Feshbach 共振是正电子湮没的主要特征，对于入射正电子能量在分子振动范围内。描述了相对较小的分子中的研究，阐明了分子内振动能量向近共振多模态态的再分配的作用，以及这些模态与正电子连续态的随后耦合，在抑制或增强这些共振中的作用。讨论了这些共振对其他分子种类湮没的影响，以及共振正电子湮没更完整理论的必要成分。
