P- andD-State Contributions to the Magnetic Moment Form Factors ofH3andHe3

The effects of reasonable admixtures of $P$- and $D$-state ($J^P={\frac{1}{2}}^{+},T=\frac{1}{2}$) components to the ground-state wave function of ${\mathrm{H}}^3$ and ${\mathrm{He}}^3$ on their magnetic moment form factors are calculated. It is found that these form factors cannot be accounted for in this way. Inclusion of the $S^{\prime }$ state and a typical $T=\frac{3}{2}$ state still leaves the magnetic form factors unexplained, although such an admixture is shown to account for the difference between the observed charge form factors. The empirical isoscalar and isovector exchange magnetic moment form factors that are needed to fit the experimental data are calculated.