Rate constants and product ion distributions for the O- and O-2(-) reactions with O-2(a (1)Delta(g)) were measured as a function of temperature from 200 to 700 K. The measurements were made in a selected ion flow tube (SIFT) using a newly calibrated O-2(a (1)Delta(g)) emission detection scheme with a chemical singlet oxygen generator. The rate constant for the O-2(-) reaction is similar to 7 x 10(-10) cm(3) s(-1) at all temperatures, approaching the Langevin collision rate constant. Electron detachment was the only product observed with O-2(-). The O- reaction shows a positive temperature dependence in the rate constant from 200 to 700 K. The product branching ratios show that almost all of the products at 200 K are electron detachment, with an increasing contribution from the slightly endothermic charge-transfer channel up to 700 K, accounting for 75% of the products at that temperature. The increase in the overall rate constant can be attributed to this increase in the contribution the endothermic channel. The charge-transfer product channel rate constant follows the Arrhenius form, and the detachment product channel rate constant is essentially independent of temperature with a value of similar to 6.1 x 10(-11) cm(3) s(-1).