Structure factor and pair correlation function of 4He monolayers adsorbed on evaporated gold

Temperature variations of the structure factor and the pair correlation function of liquid 4He films are derived within the chain-diagram approximation. Using the heat capacity data of 4He monolayers adsorbed on an evaporated gold substrate, we analyzed the structure factor and the pair correlation function as functions of the temperature and the density. The principal structure factor maximum and principal maximum of the pair correlation function increase with decreasing density and increasing temperature. The position of the principal structure factor maximum shifts smoothly toward a small value of the wave number with decreasing density, but the position of the pair correlation function increases strongly with decreasing density. Neither of the positions show a significant temperature dependence. The behaviors of the structure factor and the pair correlation function of 4He films are generally in agreement with those of bulk liquid 4He