Differential cross sections for electron/positron scattering from polyatomic molecules

We describe a new computational code which allows for the calculation of elastic and rotationally inelastic differential cross sections (DCS) for electron/positron scattering from neutral polyatomic molecules with and without permanent dipole moments. The computation can deal both with linear and nonlinear systems. In the case of polar targets a procedure which corrects for the nonconvergence of the DCS in the Body-Fixed (BF) frame is described and implemented, The corresponding state-to-state rotationally inelastic and rotationally summed differential cross sections for rotational transitions involving spherical, symmetric and asymmetric top rotors are also given by the present code. (C) 1998 Published by Elsevier Science B.V.