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The analysis of energy-transfer collisions between laser-excited atoms in terms of rate constants for separate magnetic substates requires knowledge of the excited-state density matrix for each applied laser polarisation. We study the generalised rate equation for this density matrix. Then we describe the relation between the collision signals and the M-dependent collision amplitudes. The results are applied to our recent measurements of associative ionisation of laser-excited Na(3P) atoms

POLARISATION EFFECTS IN ENERGY-TRANSFER COLLISIONS BETWEEN LASER-EXCITED ATOMS