1 - 10 of 37 articles
The mechanism for the thermal decomposition of N
containing impurity helium solids (IHS) in superfluid
He is reported. We show that the solid undergoes rapid thermal annealing leading to mobilization of the nitrogen atoms. Subsequently, the nitrogen atoms form molecular N
A self-consistent statistical method for the calculation of thermodynamic properties for simple crystals is used to study the formation of vacancies in rare gas crystals (RGC) at high temperature near the melting point. We show that the vacancy formation energy drops dramatically as the melting...
Optical and ESR spectroscopy study has revealed that the stereo-regular polymer is formed under UV- or γ-irradiation of para-diethynylbenzene (DEB) crystals over a wide temperature range (77–300 K). It has been shown that the unpaired electron of the macro-radical of the propagating linear...
The structure of 2D electron bubbles in gaseous helium is discussed. These cavities appear under the condition ng > nc, where nc ≈ 10
is much less than the critical helium gas density for the appearance of 3D electron bubbles. Far from the critical density, the 2D bubble trapping...
Multielectron bubbles (MEBs) in superfluid helium support a two-dimensional electron gas (2deg) on the surface of a sphere. In principle, electron densities can range from ∼ 10
. Wigner crystallization has been observed on a flat bulk surface of helium, but the maximum...
Facetted crystals of bcc
He have been observed with optical techniques in magnetic fields up to 9 T. Two-dimensional projections of the 3D crystals are obtained with a CCD camera. To analyze the growth rate of the various facets an interactive computer program is developed, which allows the...
The properties of hydrogen–helium mixtures at high pressure are crucial to address important questions about the interior of Giant planets e.g. whether Jupiter has a rocky core and did it emerge via core accretion? Using path integral Monte Carlo simulations, we study the properties of these...
High-resolution stimulated Raman gain spectroscopy of the Q
(0) transition of para-H
crystals with varying ortho-H
concentrations is reported. A crystal containing 0.06% of ortho-H
showed a single sharp Raman transition with the width of less than 7 MHz. The Raman signal became broader...
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