This is the publisher's version, also available electronically from http://scitation.aip.org/content/aip/journal/jcp/106/9/10.1063/1.473450.We have studied the rate constants for the reaction of O+ with N2 over the temperature range 300–1600 K and the reaction of O+ with O2 over the range 300 to 1800 K. The results are in good agreement with previous measurements made up to 900 K. The rate constant for the O+reaction with N2 shows a minimum in the temperature range 1100–1300 K. The increase above this temperature is due to N2 v=2 becoming populated. The rate constant for O++O2 shows a minimum in the 800–1100 K range. Comparing to previous drift tube measurements allows the rate constant for O2 (v>0) to be derived. The v>0 rate constant is approximately five times larger than the v=0 rate constant
