The electron affinity of atomic oxygen, an important calibration standard in negative-ion photoelectron spectroscopy, has been determined by tunable-laser photodetachment in a coaxial laser--ion-beam spectrometer to be 11 784.645±{}0.006 cm^-1. In addition, the spin-orbit splitting between the ²P3/2 and ²P1/2 states of O^- was found to be 177.13±{}0.05 cm^-1.
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Neumark et al. (1985) studied this question.
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