Standard Thermodynamic Functions of Gaseous Polyatomic Ions at 100–1000 K

The standard thermodynamic functions–heat capacity at constant pressure C^â—‹ _p, its ratio to that at constant volume, the entropy S^â—‹, the enthalpy minus that at absolute zero (H^○−H^â—‹ ₀), and the Gibbs energy function (G^○−H^â—‹ ₀)/T were calculated for 131 gaseous ions in the temperature interval 100–1000 K, and are presented in tables. The input data included structural information (bond lengths and angles), vibrational spectroscopic information (vibrational frequencies and degeneracies), and electronic level occupation and degeneracies for ions having unpaired electrons. These were taken mainly from a recent review by the authors, and supplemented by further data from the literature, updated to the end of 1985.