The radiative and predissociation lifetime depends on the vibrational state of the excited hydroxyl. v' = 0, 1 and 2 indicate the first three vibrational states of the OH. The lifetimes given below are from Smith (1970): 2 + The wavelength of emission from 0H( E ) also depends on the vibrational state. The table below gives the most probable transition for radiation from the first four vibrational levels (Crosley and Lengel, 1975): These wavelengths can be observed during laboratory or space experiments involving H2©+ recombination. The 0(^D) and the associated 6300 A emission, produced by H^O dissociative recombination, may come by way of channel (3) or channel (/')• Care should be taken not to confuse the two.
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