ELECTRON COLLISIONS WITH HIGHLY POLAR-MOLECULES - INTEGRATED AND MOMENTUM-TRANSFER CROSS-SECTIONS AND CONDUCTIVITY INTEGRALS FOR KOH AND CSOH

The authors report close-coupling calculations of the total integrated and momentum transfer cross sections for the scattering of electrons from KOH and CsOH in the energy range 0.01 to 10 eV. A cut-off dipole potential is used to account for the long-range interaction. The authors nominally chose the cut-off radius Rc such that the potential has a minimum in the vicinity of the nucleus nearest to the centre-of-mass (COM) of the molecule. The results for the total integrated and momentum transfer cross section exhibit oscillations about a mean value. The choice of a different value for Rc in additional calculations for KOH led to results for the mean value and amplitude which were virtually identical for k2<<1/(2rc) 2. A simple semi-quantitative understanding of this behaviour is presented in the context of Fabrikant's effective-range theory (ERT). Analytical expressions are given for the interaction parameters (conductivity integrals) which may be used for calculating electrical properties of gas mixtures according to the popular algorithm of Demetriades and Argyropoulos (1966).