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Considering a polar molecule in a plasma medium, the electron-molecule dipole potential is modified to incorporate the screening effect of the plasma, which is characterised by the inverse Debye-shielding-length ina -1 0. Born differential cross-sections (DCS) for the rotational excitations of target molecules like HCl, H2O and HCN are calculated for various low incident electron energies as well as for various values of . The effect of plasma screening is not only to reduce the DCS but also to alter the angular distribution. In general the DCS near the forward direction are considerably reduced. The present Born results are not expected to be reliable for strongly screening plasmas.

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