First principle computer simulations of a thin parahydrogen film adsorbed on a silica substrate at low temperature (below 6 K) yield no evidence that the top layer is liquid and/or in the proximity of a superfluid transition, as claimed in recent experimental work (Makiuchi et al. in Phys Rev Lett 123:245301, 2019). Computed values of first and second layer completion densities are in quantitative agreement with experiment, but as observed also on other substrates, the top layer is an insulating crystal, quantum-mechanical exchanges of molecules are non-existent, and the overall physical behavior of the system can be understood largely along classical lines.

如最近的实验工作所述（Makiuchi），第一原理计算机模拟了低温（低于6 K）吸附在二氧化硅衬底上的对氢氢薄膜，没有证据表明顶层是液体和/或在超流体转变附近。等在Phys Rev Lett 123：245301，2019）中。第一层和第二层完成密度的计算值与实验定量一致，但正如在其他基板上所观察到的，顶层是绝缘晶体，不存在分子的量子力学交换，并且分子的整体物理行为可以大致按照经典来理解系统。