We report results of direct Monte Carlo simulations of n-pentane and n-deca
ne at the liquid vapour interface for a number of temperatures. The intermo
lecular interactions are modeled using the last version of the anisotropic
united atom model (AUA4). We have used the local long range correction ener
gy and an algorithm allowing to select randomly with equal probability two
different displacements. The liquid and vapour densities are in excellent a
greement with experimental data and with those previously calculated using
the GEMC method.