Molecular dissociation in hot, dense hydrogen

被引:214
作者
Magro, WR
Ceperley, DM
Pierleoni, C
Bernu, B
机构
[1] CORNELL UNIV,ATOM & SOLID STATE PHYS LAB,ITHACA,NY 14853
[2] UNIV ILLINOIS,NATL CTR SUPERCOMP APPLICAT,URBANA,IL 61801
[3] UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801
[4] UNIV LAQUILA,DIPARTIMENTO FIS,I-67100 LAQUILA,ITALY
[5] IST NAZL FIS NUCL,I-00185 ROME,ITALY
[6] UNIV PARIS 06,PHYS THEOR LIQUIDES LAB,F-75252 PARIS 05,FRANCE
关键词
D O I
10.1103/PhysRevLett.76.1240
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We present a path-integral Monte Carlo study of dissociation in dense hydrogen (1.75 less than or equal to r(s) less than or equal to 2.2 with r(s) the Wigner sphere radius). As the 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.
引用
收藏
页码:1240 / 1243
页数:4
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