The nascent vibrational distribution of ClO(X(2) Pi) radicals produced in the ozone destruction reaction Cl+O-3-->ClO+O2 has been measured, using vacuum-ultraviolet laser-induced fluorescence of the ClO(C-2 Sigma(-)-X(2) Pi) transition. The nascent vibrational distribution of the ClO radicals is shown to be strongly inverted, with the relative ratio (v=0):(v=1):(v=2):(v=3):(v=4):(v=5)=0.8:1:1.3:2.4:2.9:2.7. The slope of the surprisal plots for the vibrational distribution of the product ClO is found to be (-8+/-2). Vibrational relaxation processes for the ClO radicals in the X(2) Sigma state by collisions are also studied. The upper limit values of the vibrational relaxation rate constants for ClO (v=1--0) by collisions with N-2 and Ar molecules are estimated to be both 5 x 10(-14) cm(3) molecule(-1) s(-1).