  A model of dynamic orientation using optimized radiofrequency (RF)
irradiation produced perpendicular to the holding field is developed for the
spin-1 system required for tensor-polarized fixed-target experiments. The
derivation applies to RF produced close to the Larmor frequency of the nucleus
and requires the electron spin-resonance linewidth to be much smaller than the
nuclear magnetic resonance frequency. The rate equations are solved numerically
to study a semi-saturated steady-state resulting from the two sources of
irradiation: microwave from the DNP process and the additional RF used to
manipulate the tensor polarization. The steady-state condition and
continuous-wave NMR lineshape are found that optimize the spin-1 alignment in
the polycrystalline materials used as solid polarized targets in charged-beam
nuclear and particle physics experiments.
