摘要:

AbstractThis is a compilation of extended abstracts representing research activities undertaken under the Japan‐U.S. Cooperative Science Program:Phase Transitions in Dense Astrophysical Plasmas, supported jointly by the Japan Society for the Promotion of Science and by the U.S. National Science Foundatio

ISSN:0863-1042    

DOI:10.1002/ctpp.2150330502

出版商:WILEY‐VCH Verlag    

年代:1993

数据来源: WILEY

摘要:

AbstractIt is well known that pulsed lasers can generate higher pressures than any other laboratory method if their radiation is focussed onto solid matter. However, the coherence of laser light and the resulting problem of nonuniform energy deposition due to interference effects in the beam represented a severe obstacle for quantitative use in high pressure physics. This problem has now been overcome by converting the laser light into incoherent thermal soft x‐rays in laser‐heated cavities. Experiments with the ASTERIX laser in which uniform shock waves with pressures of 8 Megabars have been generated are described in detail. It is concluded that lasers may become a quantitative new tool in high pressure phys

ISSN:0863-1042    

DOI:10.1002/ctpp.2150330503

出版商:WILEY‐VCH Verlag    

年代:1993

数据来源: WILEY

摘要:

AbstractWe present a study of the metal‐nonmetal and liquid‐vapor transitions of alkali‐atom fluids which integrates structural and electronic properties. The techniques are extensions of those used to study liquid metals and the phase transitions of pairwise interacting fluids. Structural correlations beyond mean‐field are found to be of special importance due to the large, electronically induced, cohesion of c

ISSN:0863-1042    

DOI:10.1002/ctpp.2150330504

出版商:WILEY‐VCH Verlag    

年代:1993

数据来源: WILEY

摘要:

AbstractThe model of a partially ionized gas is utilized to calculate the equation of state, electrical conductivity, and electronic magnetic susceptibility of expanded metal fluids along the coexistence curve. The effects of screening, self‐energy and cluster formation are found to be essential. The implications on the mechanism of the metal‐nonmetal transition are discus

ISSN:0863-1042    

DOI:10.1002/ctpp.2150330505

出版商:WILEY‐VCH Verlag    

年代:1993

数据来源: WILEY

摘要:

AbstractIonization of dense hydrogen plasmas is studied from a chemical picture. It is based ona prioriexisting species: electrons, protons and hydrogen atoms. All particles are treated as classical point particles interacting through pseudo‐potentials which account for quantum diffraction effects. Thermodynamics is evaluated by Monte Carlo simulations in a semi‐grand‐canonical ensemble, a suitable method developed for charged fluids. Density effects on the ionization energy are self consistently introduced in the model. The static equilibrium correlation functions are used as input in kinetic theory for the evaluation of the electrical conductivity. On the other hand, a new collision operator is derived; it is suited to treat collisions between neutral as well as between charged part

ISSN:0863-1042    

DOI:10.1002/ctpp.2150330506

出版商:WILEY‐VCH Verlag    

年代:1993

数据来源: WILEY

摘要:

AbstractOn the basis of quantum statistical theory, collisional rate coefficients are calculated for nonideal hydrogen and alkali plasmas. A brief discussion is given for plasmas in strong electric fields.

ISSN:0863-1042    

DOI:10.1002/ctpp.2150330507

出版商:WILEY‐VCH Verlag    

年代:1993

数据来源: WILEY

摘要:

AbstractBound state energies and continuum edges are calculated for densities up to the Mott density with the help of an effective wave equation for two particle states in (dense) hydrogen plasmas derived in the framework of the Green's function method. The dielectric function describing the surrounding medium is used in Random Phase Approximation.

ISSN:0863-1042    

DOI:10.1002/ctpp.2150330508

出版商:WILEY‐VCH Verlag    

年代:1993

数据来源: WILEY

摘要:

AbstractWe present new Jacobi‐Padé formulae which describe the thermodynamic properties of the electron fluid throughout the full range of degeneracy. These expressions are based on the inclusion of the classical Debye‐Hückel term, the quantum virial series and ground state Monte Carlo results. Comparisons with other investigations are

ISSN:0863-1042    

DOI:10.1002/ctpp.2150330509

出版商:WILEY‐VCH Verlag    

年代:1993

数据来源: WILEY

摘要:

AbstractMolecular dynamic computer simulations are used to investigate strongly coupled plasmas. We present some aspects of the simulation technique and some results concerning the stopping power of heavy ions in electron plasmas and the three‐body recombination in two‐component plasmas. Furthermore we briefly discuss the developement of a wave‐packet simulation technique to account for quantum correc

ISSN:0863-1042    

DOI:10.1002/ctpp.2150330510

出版商:WILEY‐VCH Verlag    

年代:1993

数据来源: WILEY

摘要:

AbstractExact results for the Madelung constants and first order anharmonic energies are given for the inverse power potentials with the Coulomb potential as the softest example. Similar exact results are obtained using the analysis of Rosenfeld on the Γ →∞ limit for the OCP internal energy, direct corelation function, screening function, and bridge functions. Knowing these exact limits for the fluid phase of the OCP allows one to determine the nature of the thermal corrections to the strongly coupled results. Solutions of the HNC equation modified with the hard sphere bridge function give an exa

ISSN:0863-1042    

DOI:10.1002/ctpp.2150330511

出版商:WILEY‐VCH Verlag    

年代:1993

数据来源: WILEY