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The angular and velocity distributions of the desorbing product CO 2 were measured in the CO oxidation on Pt(113)=(s)2(111) (001) by means of angle-resolved thermal desorption combined with cross-correlation time of flight techniques. The CO 2 desorption is sharply collimated either along the (001) step normal or the (111) terrace normal depending on the reactant coverage. The translational temperature of CO 2 desorbing in these specific directions reveals a significant variation ranging from 1350 to 1120 K with the coverages.