The rate coefficients for the ternary association reaction of vibrationally cold N ions with N and He were measured in an afterglow plasma in the temperature range of 140-250 K: = (1.02 ± 0.39)(300/) × 10 cm s. The rotational and vibrational state populations of N ions were probed in situ by time-resolved cavity ring-down spectroscopy. The rate coefficient for Penning ionization of N by helium metastable atoms was also determined: = [(2.70 ± 0.17) + (84.3 ± 5.9)e] × 10 cm s.
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