The rate of quenching of CO2(010) by O(3P) has been measured at room temperature by a temperature-jump method. The rate constant value obtained is in good agreement with a previous room-temperature measurement based on steady-state analysis of a hollow-cathode discharge in CO2. The results of fitting the room-temperature result to trajectory calculations with a curve-crossing (Nikitin) energy-transfer mechanism lead to the conclusion that the quenching rate constant should increase only slowly with increasing temperature. ¿ American Geophysical Union 1993