Reference Label	Details
Durie 1958	R. A. Durie and D. A. Ramsay, Can. J. Phys. 36, 35-53 (1958) Absorption Spectra of the Halogen Monoxides
note ClOa	D0(ClO) is corrected from 35 Cl to average Cl atomic weight of 35.4527 by adding 0.96 cm-1. The correction has been obtained by comparing ZPEs (including the Y00 term), which were estimated for the natural isotopic composition by applying standard isotopic relationships to the spectroscopic constants given by Huber 1979. This approach neglects possible electronic isoptopic shifts.
note ClOb	Transitions A 2Pi3/2 -> X 2Pi3/2, v'=2-25, v"=0, and A 2Pi1/2 -> X 2Pi1/2, v'=2,4,8, v"=1 and v'=2, v"=2 in 35ClO. The nu00 values of Durie 1958 are very close to those of Coxon 1976, with the exception that the vibrational numbering in the A 2Pii states of Durie 1958 are one more than those of Coxon 1976. The highest v' observed by Durie 1958 is one less than that of Coxon 1976 (nominally the same, because of different numbering). Durie 1958 show that the dissociation limit of ClO A 2Pi is Cl(2P3/2) + O(1D). With a 'short extrapolation" after the last n00 observed (37997.4 cm-1, same as v'=24 -> v"=0 of Coxon 1976), they obtain a limit of 38020 +- 10 cm-1 and by subtracting the O(1D) term they get D0(35ClO) = 22152 +- 10 cm-1. This is 32 cm-1 less than the value obtained by Coxon 1976. However, the estimated limit of 38020 cm-1 of Durie 1958 is lower than the last n00, 38021.06 cm-1, observed by Coxon 1976. Hence, one has to amplify the stated uncertainty. The 'short extrapolation' amounts to ~23 cm-1, and it was presumably obtained by a Birge-Sponer fit, notorius for not extrapolating properly the long-range behavior, which according to Coxon 1976 sets in between v'=20 and v'=21 of A 2Pi. taking the D0 value of 22152 cm-1 and applying the correction for F1 leads to D0 = 22149.5 +- 50 cm-1, where the adopted uncertainty is roughly double the extrapolated amount.