Université de Fribourg

Atomic bubbles in impurity-stabilized solid ⁴He

Lebedev, Victor ; Moroshkin, Peter ; Weis, Antoine

In: Fizika Nizkikh Temperatur, 2010, vol. 35, no. 4, p. 391-395

The optical absorption and fluorescence spectra of alkali atoms isolated in liquid and solid He matrices depend on specific macroscopic matrix properties, such as their molar volume and (anisotropic) elasticity constants, and provide thus information about the quantum matrix. We have applied optical spectroscopy to investigate the properties of a recently discovered impurity-stabilized doped...

Université de Fribourg

Atomic and molecular defects in solid ⁴He

Moroshkin, Peter ; Hofer, Adrian ; Weis, Antoine

In: Physics Reports, 2008, vol. 469, no. 1, p. 1-57

The studies of defects formed by impurity particles (atoms, molecules, exciplexes, clusters, free electrons, and positive ions) embedded in liquid and solid ⁴He are reviewed. The properties of free electrons and neutral particles in condensed helium are described by the electron (atomic) bubble model, whereas for the positive ions a snowball structure is considered. We compare the properties of...