RARE EARTHS. IV. DISSOCIATION ENERGIES OF THE GASEOUS MONOXIDES OF THE RARE EARTHS.
PENNSYLVANIA UNIV PHILADELPHIA DEPT OF CHEMISTRY
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The dissociation energy of the gaseous rare earch monoxides together with the closely related compounds ScO and YO were determined from Knudsen effusion and mass spectrometric isomolecular oxygen-exchange reaction studies. It is shown that there is a double periodicity in the variations of the dissociation energies with atomic number and that these variations closely match those of the heats of sublimation of the rare earth metals. Assuming a common bound state for the monoxides, MO--, it is shown that the variations in the dissociation energies in the lanthanide series correspond to the magnitude of the 4fn to 4fn-15d transitions of the divalent ions. Author9
- Atomic and Molecular Physics and Spectroscopy