Low Temperature Physics: 35, 299 (2009); https://doi.org/10.1063/1.3115814 (4 pages)
Atomic bubbles in impurity-stabilized solid 4He
V. Lebedev, P. Moroshkin, and A. Weis
Physics Department, University of Fribourg, Chemin du Musée 3, 1700 Fribourg, Switzerland
Received January 4, 2009
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 4He solid that exists in equilibrium with pressurized superfluid helium close to the solidification/melting point of pure helium. The difference between the local He density around the implanted atoms obtained in the present experiment and the average density measured earlier suggests that the impurity-stabilized solid He is in fact a porous structure filled with liquid helium.
PACS: 61.72.–y Defects and impurities in crystals; microstructure;
Key words: absorption spectra, optical spectroscopy, superfluid helium, solid helium.