Abstract
The vibrational temperatures of N2 and CO in binary gas mixture and in the VV quasiequilibrium regime of high vibrational temperature and low kinetic temperature were measured in a flow tube apparatus. The Penning ionization with He (23S) technique was used to determine the vibrational temperatures of both gases. The Treanor-Teare expression relating vibrational temperatures for such conditions was verified. The formulation of the Penning ionization technique for CO allowed the CO rotational energy and the kinetic energy of relative motion between CO and He to play a role in the normally nonenergetically allowed CO(X, 0)→CO+(B, 1) excitation reaction. The unexpected result of a collisional quenching rate that is smaller for CO+(B, 1) than for CO+(B, 0) was also observed.
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