Obiettivo A new type of the phase transition at the charged surface of quantum liquid -reconstruction of the surface with increasing the stretching electric field -- was discovered in recent experiments with liquid hydrogen and helium. This phenomenon consists in formation of a static solitary wave of deformation at the surface of the liquid in a field higher some critical value. In accordance with experimental data this phenomenon is close to the second order phase transition. The main objective of the project consists in understanding the nature of this effect and in further experimental and theoretical investigations of the static and dynamic non-linear phenomena at the surface of quantum liquids.The advantages of using of the charged surface of quantum liquids - liquid hydrogen and helium, are that under the condition when an external electric field in the bulk of liquid is screened totally by the charged layer at the surface, the driving electric force is applied to the surface, only. This permits to generate surface waves in a wide range of frequencies without excitation of the bulk of liquid, and, hence, to study, dynamics of the non-linear surface waves under well-controlled experimental conditions.Low density and small viscosity of quantum liquids allow to expand significantly the range of frequencies, where weakly attenuated surface waves can be observed, in comparison with conventional liquids. This provides a unique possibility for studies of nonlinear phenomena at the surface, for example, stochastic oscillations of the surface and formation of the turbulent regime of capillary waves.A detailed experimental investigations of the nonlinear phenomena at the surface of liquid will include the following measurements: Studies of evolution of shape of the charged surface of liquid hydrogen with increasing the stretching electric field, and investigations of influence of the boundary conditions by increasing the diameter of the experimental cell on the amplitude of the static solitary wave. Studies of the dispersion law of the surface waves at the flat and reconstructed surface of liquid hydrogen. Measurements of the distribution function for the amplitudes of the non linear waves at the charged surface over frequency under the conditions of broad band- and narrow band excitation of the surface by an alternative electric field. Determination of the range of frequencies where the self-similar distribution of the amplitudes of waves can be formed, and of the characteristic frequencies, at which the transition of the turbulent regime to the viscous attenuation regime of the surface oscillations takes place (high frequency edge of the inertial interval).A theoretical consideration of the surface reconstruction in static electric field will be developed with the intention to explain the observed peculiarities of the reconstruction phenomenon. The computer simulations of the nonlinear dynamics at the surface of liquid hydrogen in a restricted geometry will be performed, which allows direct comparison of the experimental data with the theoretical predictions. From this comparison one could obtain important information on energy transfer in a system of nonlinear surface waves. This relates to important physical problem of the statistic nonlinear system with essentially discrete spectrum of self-frequencies.The work made in frames of this project will lead to the development of better quantitative understanding of the phenomena in a wide class of nonlinear non equilibrium systems and to the formation of new physical intuition in this fast progressing area of a modern science. Programma(i) IC-INTAS - International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993- Argomento(i) 1B - Condensed Matter, Optics and Plasma Physics OPEN - OPEN Call Invito a presentare proposte Data not available Meccanismo di finanziamento Data not available Coordinatore Niels Bohr Institute Contributo UE Nessun dato Indirizzo Blegdamsvej 17 2100 Copenhagen Danimarca Mostra sulla mappa Costo totale Nessun dato Partecipanti (3) Classifica in ordine alfabetico Classifica per Contributo UE Espandi tutto Riduci tutto Russian Academy of Sciences Russia Contributo UE Nessun dato Indirizzo Institutskii Prospekt 15 142432 Chernogolovka, Moscow district Mostra sulla mappa Costo totale Nessun dato Siberian Branch of Russian Academy of Sciences Russia Contributo UE Nessun dato Indirizzo Prospect Acad. Lavrentyeva, 1 630090 Novosibirsk Mostra sulla mappa Costo totale Nessun dato Universität Konstanz Germania Contributo UE Nessun dato Indirizzo Universitätsstr. 10 78457 Konstanz Mostra sulla mappa Costo totale Nessun dato
