Dissociation Energies of Diatomic Molecules of the Transition Elements. II. Titanium, Chromium, Manganese, and Cobalt

Using information derived from a combination of effusion and mass-spectrometric techniques, the dissociation energy of Co2 has been calculated from the ratio of dimeric and monomeric cobalt in equilibrium with the liquid as D00(Co2)=39±6 kcal. Upper limits to the dissociation energy of Ti2, Cr2, and Mn2 are also estimated as D00(Ti2)<58 kcal, D00(Cr2)<44 kcal, D00(Mn2)<21 kcal. These results are correlated with the energy required to promote the atom to the lowest-lying bonding or valence state of electron configuration 3dn—14s.