Dissociation energy of the molecule ZnI

The dissociation energy (D00) of the molecule ZnI was determined from gaseous equilibrium measurements over the range 993–1058 K. The Ag–Zn–I chemical species were generated by reaction of I2(g) with a Ag/Zn/Cu sample in an effusion cell source, and their abundances were monitored by mass spectrometry. Both the resulting D00(ZnI)=35.7±1.5 kcal mol−1 and a previously reported equilibrium value for D00(ZnCl) are somewhat larger than reported theoretical values, with the Gaussian MP2 method yielding D00 values in closest agreement with experiment.