A molecular model for positron complexes is developed and used to study the effects of the nucleus-positron distance long-range regime on the 2γ annihilation rates ( ) of atomic complexes. The available data for of some systems are then rationalized on its basis and some predictions are made. The model is shown to be capable of generating information on positron positioning and of making predictions of values of in molecular complexes as well.
We develop an adiabatic valence-bond theory of the positronium hydride, HPs, as a heteroisotopic diatomic molecule. Typical heteronuclear ionic behaviour comes out at bonding distances, yielded just by finite nuclear mass effects, but some interesting new features appears for short distances as well.
We resort to a previously introduced molecular model for positron complexes to study the molecular structures of Ps 2 O and PsOH and to explore their analogies and differences from the molecular structure of water.
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