TOTAL CROSS-SECTIONS FOR POSITRON SCATTERING BY A SERIES OF MOLECULES

The additivity rule is employed to obtain the total (elastic+inelastic ) cross-sections for positron scattering from molecules including a nu mber of diatomic, polyatomic molecules (H-2, N-2, HCl, CO2, NH3, SF6, CH4, C2H4 and C3H8) over an incident energy range of 10-1000 eV. The t otal cross-sections (TCS) of the constituent atoms of molecules are ob tained by employing a complex optical model potential (composed of sta tic, polarization and absorption potential). The present results are c ompared with experimental data and other theoretical calculations, goo d agreement is obtained in intermediate- and high-energy region.