Determination by the mass spectrometric Knudsen cell method of the atomization energies of the molecules PO and PO2

Abstract

The dissociation energy of PO(g), D^°₀(PO)= 593.0 ± 8 kJ mol^–1 has been measured thermochemically. This result supports the value for D^°₀(PO) obtained from the predissociation in the D′²Π state of PO, D^°₀(PO)⩽ 593 kJ mol^–1 and strongly suggests that this predissociation is an exact one. The atomization energy of PO₂(g), has been determined to be D^°₀(PO₂)= 1086.2 ± 11 kJ mol^–1 and is shown to be consistent with spectroscopic data for this molecule.