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A unified semiclassical theory for calculating cross section and analysing powers of al1 ranks for polarized heavy ion elastic scattering is applied to explain deviations from the structureless pattern normally encountered in the cross section, which are interpreted as due to interference between diffraction and refraction. Refractive, negative angle or far-side scattering is then discussed and is shown to be a target-size effect at Elab ≈ 20 MeV for [MATH]Li + 12C. The limitations of the semiclassical method are then shown in terms of the necessity of performing a huge number of integrals numerically. Lastly, a quantum mechanical approach for handling positive and negative angle scattering is presented

SEMICLASSICAL AND QUANTUM MECHANICAL TREATMENTS OF POSITIVE AND NEGATIVE ANGLE POLARIZED HEAVY ION SCATTERING