Two-fluid hydrodynamic model for superfluids in fractal dimensions

It was recognized last years that the state of quantum liquids at nanoscales could be considered as some new state of quantum matter. Nanoporous media found to show the fractal geometry behavior so the problem of the correct description of quantum liquids in the space with fractal dimensions is a rather interesting. In the present work we develop two-hydrodynamic model for superfluids in fractal geometry and investigate the wave propagation and phenomena like to "sound transformations" in superfluids in this case. © 2009 IOP Publishing Ltd

An equilibrium thermostatistics of a nonextensive finite system: Canonical distribution and entropy

A simple model is presented to illustrate the equilibrium thermostatistics of a nonentensive finite system. Interaction between the finite system and the reservoir is taken into account as a nonextensive term λ H1H2 in the expression of total energy ( H1 and H2 are the energy of the finite system and the reservoir respectively, λ is nonadditivity parameter). In the present paper, a case with harmonic reservoir potential is considered. Energy probability distribution, average energy, heat capacity and entropy function for energy distribution are derived in different finite systems including those with constant density of state in energy, the ideal gas and the phonon gas. © 2012 Elsevier B.V. All rights reserved

Experimental cell for molecular beam deposition and magnetic resonance studies of matrix isolated radicals at temperatures below 1 K

We present the design and performance of an experimental cell constructed for matrix isolation studies of H and D atoms in solid H 2 /D 2 films, which are created by molecular beam deposition at temperatures below 1 K. The sample cell allows sensitive weighing of the films by a quartz microbalance (QM) and their studies by magnetic resonance techniques in a strong magnetic field of 4.6 T. We are able to regulate the deposition rate in the range from 0.01 to 10 molecular layers/s, and measure the thickness with &asymp; 0.2 monolayer resolution. The upper QM electrode serves as a mirror for a 128 GHz Fabry-Perot resonator connected to an electron spin resonance (ESR) spectrometer. H and D atoms were created by RF discharge in situ in the sample cell, and characterized by ESR and electron-nuclear double resonance. From the magnetic resonance measurements we conclude that the films are smooth and provide homogeneous trapping conditions for embedded atoms. The current sample cell design also makes it possible to calibrate the ESR signal and estimate the average and local concentrations of H and D radicals in the film.</p

Guiding and Trapping Electron Spin Waves in Atomic Hydrogen Gas

We present a high magnetic field study of electron spin waves in atomic hydrogen gas compressed to high densities of 10^18 cm^-3 at temperatures ranging from 0.26 to 0.6 K. We observed a variety of spin wave modes caused by the identical spin rotation effect with strong dependence on the spatial profile of the polarizing magnetic field. We demonstrate confinement of these modes in regions of strong magnetic field and manipulate their spatial distribution by changing the position of the field maximum.Comment: 5 pages, 4 figure

Electron Spin Resonance Study of Electrons Trapped in Solid Molecular Hydrogen Films

© 2015 Springer Science+Business Media New York We report on the measurements of electrons trapped in solid molecular films of H(Formula presented.), HD, and D(Formula presented.). A narrow ESR line associated with the trapped electrons was detected with (Formula presented.), which turned out to be shifted by (Formula presented.)0.3 G from the free electron resonance. Comparison is made with earlier measurements where a similar line has been seen. In addition, for a (Formula presented.) mixture, after raising the temperature above 1 K, we observe a strong line at the location of the electron cyclotron resonance. The line amplitude is dependent on temperature and has an activation energy of 26 K. We believe that at elevated temperatures, electrons diffuse from the bulk of the film to the surface

Electron Spin Resonance Study of Electrons Trapped in Solid Molecular Hydrogen Films

© 2015, Springer Science+Business Media New York.We report on the measurements of electrons trapped in solid molecular films of H (Formula presented.) , HD, and D (Formula presented.). A narrow ESR line associated with the trapped electrons was detected with (Formula presented.) , which turned out to be shifted by (Formula presented.) 0.3 G from the free electron resonance. Comparison is made with earlier measurements where a similar line has been seen. In addition, for a (Formula presented.) mixture, after raising the temperature above 1 K, we observe a strong line at the location of the electron cyclotron resonance. The line amplitude is dependent on temperature and has an activation energy of 26 K. We believe that at elevated temperatures, electrons diffuse from the bulk of the film to the surface

Guiding and Trapping of Electron Spin Waves in Atomic Hydrogen Gas

We present a high magnetic field study of electron spin waves in atomic hydrogen gas compressed to high densities of similar to 10(18) cm(-3) at temperatures ranging from 0.26 to 0.6 K. We observed a variety of spin wave modes caused by the identical spin rotation effect with strong dependence on the spatial profile of the polarizing magnetic field. We demonstrate confinement of these modes in regions of strong magnetic field and manipulate their spatial distribution by changing the position of the field maximum