In order to simulate experimental results of scattering of an I-2 beam from
liquid perfluorpolyeter (PFPE) surface we developed a model potential for
the gas-polymer interaction at the liquid surface and solved the dynamics o
f the collision process by the classical trajectory method. The energy tran
sferred in the process to the vibrational mode of the I-2 molecule and to t
he liquid surface was investigated as a function of potential parameters.