The emphasis is made on experimentally observed indications of the presence of metastable ion dipoles in solid helium. Similar quasiparticles possessing positive scattering length for injected electrons are assumed to exist ...

For the thickness of a liquid or solid quantum film, like liquid helium or solid hydrogen, there exist still open questions about how the film thickness develops in certain limits. One of these is the thick film limit, ...

A promising way to investigate 2D contact phenomena is proposed. This method is based on the idea ot depositing surface state electrons (SSE) on a thin layer of liquid helium covering the surface of a solid sample ...

Currently, there is some ambiguity in the problem of decay of a single donor into charged fragments. Thus, in the well-known Ostwald approximation used for semiconductors (ice being one of them) the donor dissociation degree ...

Discussed in the paper are possibilities for description of electron conduction in transitional density range separating electron free and localized states in cryogenic media.