EXOERGIC COLD COLLISIONS IN ALKALI MIXTURE G. D. Telles, S. R. Muniz, A. Antunes, P. Cardona, M. S. Santos, L. G. Marcassa and V. S. Bagnato Instituto de F\'{\i}sica de S\~ao Carlos Universidade de S\~ao Paulo Cx. Postal 369 - S\~ao Carlos -SP - Brasil 13.560 - 970 We have developed a new vapor cell Magneto optical trap to investigate heteronuclear cold collisions. At the present we have concluded the investigation of exoergic collisions with the following mixtures : Na/Rb, K/Rb, Na/K and Rb/Cs. Laser intensity dependence of rate coefficients were investigated.