THE DISSOCIATION ENERGIES OF DIATOMIC MOLECULES OF THE TRANSITION ELEMENTS. PART I. NICKEL.
ARMY MATERIALS RESEARCH AGENCY WATERTOWN MASS
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The Ni2 molecule was shown to exist in the vapor phase over liquid nickel above 2000K. Using information derived from a combination of effusion and mass spectrometric techniques, the dissociation energy of Ni2 was calculated from the ratio of dimeric and monomeric nickel in equilibrium with liquid. The resulting value 54.5 5 kcal. From the accepted value of the heat of sublimation of nickel and the dissociation energy of the dimer the heat of sublimation for the process 2 Ni solid Ni2gas is, at 0 K, 146.9 7 kcal. Author