The validity of the unitarised Born (B 11) approximation for representing the T-matrix elements for electron-polar-molecule collisions is investigated for a number of polar systems. For intermediate and high values of the angular momentum (usually I2 5), the B 11 results are in excellent agreement with those of a more elaborate close-coupling calculation. The method provides an efficient, economical means for calculating the higher angular momenta T-matrix elements that are needed in the completion formulae for polar-molecule cross sections. The methods have an advantage over such comparable schemes as the fixed-point-dipole technique in that contributions from potential moments above the dipole can be simply included.
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Padial et al. (1981) studied this question.