科研之友
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摘要
Due to the dominant electron capture by positrons from the molecular shell and the spatial dephasing across the shellwidth, a powerful diffraction effect universally underlies the positronium (Ps) formation from fullerenes. This results in trains of resonances in the Ps formation cross section as a function of the positron beam energy, producing structures in recoil momenta in analogy with classical single-slit diffraction fringes in the configuration space. This work opens a hitherto unknown avenue of Ps spectroscopy with nanomaterials and motivates level-differential measurements.
- 出版日期2017-2-10
