Dissociation energy of gaseous YPd by Knudsen-effusion mass spectrometry

Abstract

The dissociation equilibrium of the new molecule YPd has been investigated by Knudsen-effusion mass spectrometry over the temperature range 1975–2286 K. Thermal functions of YPd have been calculated using theoretically predicted molecular parameters. The dissociation energy, D^°₀, of 237 ± 15 kJ mol^–1 was obtained from second- and third-law evaluations. This value is discussed in terms of empirical models of bonding. The derived standard enthalpy of formation, ΔH^°_f,298.15, is 564 ± 15 kJ mol^–1.