We have measured the rate constants for the reactions of N+ and N2+ with O2 from room temperature to 1600 and 1800 K, respectively. In the N+ reaction the rate constants increase with increasing temperature to 1000 K and level out at the collisional value above that. For the N2+ reactions the rate constant decreases with temperature to 1000 K and increases above that value. Internal temperature dependences are derived by combining the data with previous drift tube measurements. The internal energy dependence of the N+ reaction appears to be a complicated function of vibrational, rotational, and electronic energy. In the N2+ reaction, rotational and translational energy behave similarly, and O2 vibrations are found to increase the rate constant dramatically. If all O2 vibrations are involved, a factor of six enhancement is found. Alternatively, O2 (ν = 2) allows exothermic production of O2 + (a4Πu). If the enhancement is due to this channel, then a factor of 20 enhancement is derived.
|Number of pages
|International Journal of Mass Spectrometry and Ion Processes
|Published - 1997
Bibliographical noteFunding Information:
We would like to thank John Williamson and Paul Mundis for technical support. The research was supported by the Air Force Office of Scientific Research under task 2303EP4.
- Ion chemistry
- Positive ions