ΔHf: -173.0 kcal/mol, REF: D. D. Wagman, W. H. Evans, V. B. Parker, R. H. Schumm, I. Halow, S. M. Bailey, K. L. Churney, R. L. Nuttall, J. Phys. Chem. Ref. Data Suppl. 11, 2 (1982). I.P.: 13.3 eV, REF: H. M. Rosenstock, K. Draxl, B. W. Steiner, J. T. Herron, "Energetics of Gaseous Ions," J. Phys. Ref. Data, 6 Suppl. 1 (1977).