Positronium Nanocavities in Liquids

Abstract

The model of a strongly curved vapor-liquid interface developed earlier is applied to the description of positronium nanocavities in liquids. It is shown, for the first time, that it is possible on the basis of this model to calculate the lifetime of a positronium in a cavity and its radius without introducing additional adjustment parameters. The resultant values agree satisfactorily with the experimental data. The radii of nanocavities calculated according to the proposed model are noticeably higher than those obtained on the basis of the classical theory of nucleation. Using water and liquid argon as examples, the possibility of describing the experimental data on nanocavities in liquids and velocities of homogeneous nucleation in a supersaturated vapor is demonstrated from the general standpoint.

A scaling law for the dust cloud in radio frequency discharge under microgravity conditions

“…Relations like (20) are encountered, e.g., in the theories of positronium self-trapping in liquids. 39 To find p st we consider the limiting case a p → a d . Obviously here R p → r d , and the field of a particle is screened inside the Wigner-Seitz cell due to quasineutrality of the latter no matter how small (as compared to the cell radius) the screening length is.…”

Molecular dynamics study of nanobubbles in the equilibrium Lennard-Jones fluid

“…It is worth mentioning that formulas (5) and (11) yield a good correlation with experimental data on positronium nanocavities in liquids whose size is of the order of intermolecular distance. 56 For nanobubbles in the Lennard-Jones liquid treated in this work, Tolman's length is assumed to be negative (Table I). This means that the size-dependent surface tension (7), which can be applied to bubbles as well, is less than σ ∞ in the entire range of their sizes (see also Ref.…”