Electronic structure and enthalpy of hydrogen and helium mixtures

Details Electronic structure and enthalpy of hydrogen and helium mixtures Electronic structure and enthalpy of hydrogen and helium mixtures

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992scp..confr..17r&link_type=abstract

Presented at the International Conference on the Physics of Strongly Coupled Plasmas, Rochester, NY, 17-21 Aug. 1992

Physics

Atomic Structure, Body Centered Cubic Lattices, Electron Density (Concentration), Enthalpy, Equations Of State, Face Centered Cubic Lattices, Helium, Hydrogen, Quantum Mechanics, Jupiter (Planet), Laser Doppler Velocimeters, Planetary Atmospheres, Pseudopotentials, Saturn (Planet), Self Consistent Fields

Scientific paper

The first local density approximation (LDA) calculations of the electronic structure, equation of state, and enthalpy of mixing were carried out for a number of different compositions of hydrogen and helium in bcc and fcc lattices. These are fully quantum mechanical, self-consistent calculations utilizing state-of-the-art methods of electron band theory, which make no assumptions regarding pressure ionization. The major approximation in the LDA method is that the exchange and correlation energy is given by a free electron functional in terms of the local electron density. The majority of previous mixture calculations start with the assumption that both hydrogen and helium are pressure-ionized so that the electronic structure is approximately that of free or weakly screened electrons in the presence of positive ions. Stevenson used a hard-sphere mixture model for the ions with an ion-ion pseudopotential to account for electron screening and predicted that a mixture containing 7% helium by number, the composition believed to be present in Jupiter and Saturn, would phase separate at a temperature of about 7000 K at 8 Mbar. Subsequent calculations carried out for the fully ionized mixture and for a mixture of screened ions (linear response theory) have all arrived at predictions similar to those of Stevenson. MacFarlane and Hubbard performed Thomas-Fermi-Dirac calculations for mixing enthalpies of hydrogen and helium in bcc and fcc lattices and predicted that phase separation would not occur at any temperature.

Affiliated with

Also associated with

No associations

Rating

Electronic structure and enthalpy of hydrogen and helium mixtures does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Electronic structure and enthalpy of hydrogen and helium mixtures, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic structure and enthalpy of hydrogen and helium mixtures will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1555939