高温高压下稠密氢的离解与电离

应用自恰变分自由能模型描述了在化学平衡下,H2,H,H ,e构成地混合物在天体物理和高压实验中遇到情形下的各种相互作用及压力与温度效应引起地离解和电离现象.目前的模型预测了在压力电离区存在一热力学不稳定状态,当温度Tc=15.5 kK,压力Pc=58.3 GPa和密度ρc=0.3226 g/cm3时发生等离子体相变,此理论预测结果与各种模型计算结果进行了比较分析.

Ionization and dissociation of dense hydrogen at high pressures and temperatures

The self-consistent fluid variational free energy model has been used to describe an interacting mixture of H2 ,H, H+ , and e in the chemical equilibrium. This general model describes the phenomena of dissociation and ionization caused by pressure and temperature effects, as encountered in astrophysical situations and high-pressure experiments. The present model is thermodynamically unstable in the pressure-ionization regime and predicts the existence of a plasmas phase transition occurs between a critical point Tc = 15.5 K, Pc = 58.3 Gpa, and ρc = 0.3226 g/cm3. In the high-density phase, complete pressure ionization is reached suddenly. Theoretical results for the critical point of the hypothetical plasma phase transition in hydrogen have been compared with the calculations of the various models.