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Gu, J.D.; Chen, K.X.; Xie, Y.M.; Schaefer, H.F.; Morris, R.A.; Viggiano, A.A., The electron affinities of PF and PF2, J. Chem. Phys., 1998, 108, 3, 1050-1054, https://doi.org/10.1063/1.475466 . [all data]