Abstract
The structure and thermal properties of novel mesoporous inert-gas solids were studied by synchrotron x-ray diffraction. The materials were prepared by injecting a jet of helium containing dilute amounts of inert atoms and molecules (Ne, Kr, ${\mathrm{N}}_{2}$) into superfluid helium. The characteristic size of the constituent building blocks is $\ensuremath{\sim}60\AA{}$, and the density is $\ensuremath{\gtrsim}{10}^{20}\mathrm{impurity}$ atoms per c${\mathrm{m}}^{3}$. The Kr and ${\mathrm{N}}_{2}$ solids are stable outside of liquid He, up to temperatures above 10 K. These materials may find various applications as a new type of porous medium for fundamental physics, as well as in cluster physics, matrix isolation spectroscopy, and catalysis of low temperature chemical reactions.
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