1.
Phys Rev Lett
; 107(10): 103201, 2011 Sep 02.
Artículo
en Inglés
| MEDLINE
| ID: mdl-21981501
RESUMEN
The mechanisms for multimode vibrational couplings in resonant positron annihilation are not well understood. We show that these resonances can arise from positron-induced distortions of the potential energy surface (target response to the positron field). Though these distortions can transfer energy into single- and multiquantum vibrations, they have so far been disregarded as a pathway to resonant annihilation. We also compare the existing annihilation theories and show that the currently accepted model can be cast as a special case of the Feshbach annihilation theory.