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note O2+fKong 1996 give IE(O2) = 129 892 +- 2 cm-1, given as term value for a 4Piu (v=0, F) <- X 3Sigmag- F2(v=0, J=1); this needs to be increased by 4 cm-1 to refer to X 3Sigmag- F1(v=0, J=1), see note O2+. With nu00 from Huber 1979 for b <- a of 16666.74 cm-1 one obtains 146562.7 cm-1 as the IE(o2) from the lowest existing level of O2 to O2+ b 4Sigmag- (v=0), or 146561.7 cm-1 from the hypothetical level v=0, N=J=0 of X 3Sigmag-. The latter coincides with the 18.1713 +- 0.00025 eV obtained presumably in the same manner by Hsu 1997 and repeated in Hsu 1998. Note that this is ~ 10 cm-1 lower than the estimate of Cosby 1992, see note O2+d, but 6 cm-1 higher than the value of Yoshino 1968.