Temperature dependence of molecular kinetic energy in dense fluid parahydrogen

We present an experimental and path integral Monte Carlo study of the singlemolecule dynamics in fluid parahydrogen. The experiment consists in an inelastic neutron
scattering determination of the translational kinetic energy, , as a function of temperature at a density close to the triple point. Experimental and simulated values of are found to be in good agreement in the investigated temperature range. Discrepancies are found with a simple harmonic model parametrized by the value of the zero-point kinetic energy.