超临界氖中Frenkel线的实验证据
Experimental evidence of the Frenkel line in supercritical neon
摘要：
最近的研究表明，超临界状态由类液体和类气体状态组成，其中粒子动力学和关键系统性质有质的不同。我们报告的实验证据的结构交叉在超临界氖在压力和温度条件下显着超过临界点值：250 $\,P_c$和6.6 $\,T_c$。实验结果表明，由结构因子随压力的变化证明了中程有序结构的交叉。我们还观察到的短程有序结构的交叉表示的配位数的变化。跨接的相对宽度较窄，在压力和温度范围内小于10- 12%.通过将实验结果与分子动力学模拟的结果进行比较，我们认为所观察到的结构交叉可以归因于Frenkel线，并讨论了结构交叉与超临界物质动力学和热力学性质的定性变化之间的关系.
英文摘要：
Recent research suggests that the supercritical state consists of liquidlike and gaslike states where particle dynamics and key system properties are qualitatively different. We report experimental evidence of the structural crossover in supercritical neon at pressure and temperature conditions significantly exceeding the critical point values: 250$\,P_c$ and 6.6$\,T_c$. The experimental results show a crossover of the medium-range order structure evidenced by the change of the structure factor with pressure. We also observe the crossover of the short-range order structure indicated by changes in the coordination number. The relative width of the crossover is fairly narrow and is smaller than 10-12 \% in pressure and temperature. By comparing our experimental results with molecular dynamics simulations, we suggest that the observed crossover can be attributed to the Frenkel line and discuss the relationship between the structural crossover and qualitative changes of dynamical and thermodynamic properties of supercritical matter.
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