Theoretical Magnetic Form Factors ofCo++andFe++in Their Monoxides

The spherical magnetic form factors of ${\mathrm{Co}}^{++}$ in CoO and ${\mathrm{Fe}}^{++}$ in FeO are calculated, including the effect of unquenched orbital magnetic moment. Expansions relative to the "spin-only" case are found to be 11% for ${\mathrm{Co}}^{++}$ and 9% for ${\mathrm{Fe}}^{++}$. For CoO this is a major step in the quantitative explanation of the 15-17% expansion of the experimental curve compared to the Freeman-Watson "spin-only" curve. For FeO no good experimental data are yet available for comparison.