29 research outputs found
The Physics of Liquid Para-Hydrogen
Macroscopic systems of hydrogen molecules exhibit a rich thermodynamic phase
behavior. Due to the simplicity of the molecular constituents a detailed
exploration of the thermal properties of these boson systems at low
temperatures is of fundamental interest. Here,we report theoretical and
experimental results on various spatial correlation functions and corresponding
distributions in momentum space of liquid para-hydrogen close to the triple
point. They characterize the structure of the correlated liquid and provide
information on quantum effects present in this Bose fluid. Numerical
calculations employ Correlated Density-Matrix(CDM)theory and Path-Integral
Monte-Carlo(PIMC)simulations. A comparison of these theoretical results
demonstrates the accuracy of CDM theory. This algorithm therefore permits a
fast and efficient quantitative analysis of the normal phase of liquid
para-hydrogen.We compare and discuss the theoretical results with available
experimental data.Comment: 14 pages, 7 figure