Physics – Condensed Matter
Scientific paper
1996-01-24
Physics
Condensed Matter
5 pages, RevTeX + 4 figures, to appear in Physical Review Letters, online version available at http://www.tc.cornell.edu/~wmag
Scientific paper
10.1103/PhysRevLett.76.1240
We present a path-integral Monte Carlo study of dissociation in dense hydrogen ($1.75 \leq r_s \leq 2.2$, with $r_s$ the Wigner sphere radius). As temperature is lowered from $10^5$ to 5000 K, a molecular hydrogen gas forms spontaneously from a neutral system of protons and electrons. At high density, $r_s < 2.0$, thermally activated dissociation is accompanied by decreasing pressure, signaling the presence of a first order transition and critical point. The decrease in electron kinetic energy during dissociation is responsible for the pressure decrease and transition. At lower density the phase transition disappears.
Bernu Bernard
Ceperley David. M.
Magro W. R.
Pierleoni Carlo
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