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We study the effect of phase relaxation on coherent superpositions ofrotating clockwise and anticlockwise wave packets in the regime of stronglyoverlapping resonances of the intermediate complex. Such highly exciteddeformed complexes may be created in binary collisions of heavy ions, moleculesand atomic clusters. It is shown that phase relaxation leads to a reduction ofthe interference fringes, thus mimicking the effect of decoherence. Thisreduction is crucial for the determination of the phase--relaxation width fromthe data on the excitation function oscillations in heavy--ion collisions andbimolecular chemical reactions. The difference between the effects of phaserelaxation and decoherence is discussed.Comment: Extended revised version; 9 pages and 3 colour ps figure

Effect of phase relaxation on quantum superpositions in complex collisions