Enhanced nuclear polarization of D in solid HD

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Abstract
Nuclear spin polarizations of D comparable to those of H in solid HD are achieved under conditions of extremely long H and D spin-lattice relaxation times such as are required for "frozen-spin" polarized targets. Standard steady-state dynamic polarization methods, spin mixing at low fields, and a new technique of adiabatic passage through "forbidden" transitions are employed. The requirements of strong magnetic fields, low temperature, and rapidity of spin-lattice relaxation rate, in order to obtain highly polarized deuterons in solid HD, become much less stringent than for the case of equilibrium D polarization, facilitating the utilization of solid-HD targets for polarized-D as well as polarized-H applications.