Recent developments in the field of polarized solid state target materials

With the help of systematic EPR and NMR studies under various conditions the polarization properties of some established target materials could be considerably improved. In (LiD)-Li-6 preliminary polarization results of the still ongoing investigations are 52 %(1) at 150 mK and 18 % at 1 K both at a magnetic field of 2.5 T. Radiation doped d-butanol was polarized up to 48 %(1) and 13 % under the same conditions. Additionally first investigations were started into a group of materials, the alkanes, which have not been tested for polarization purposes so far. Difficulties specific to these compounds could be overcome with the result of promising +16.2 %/ - 13.5 % at 1 K/2.5 T in a hybrid sample of chemically doped n-pentane/butanol. In this context new insights could be also gained into the polarization physics of radiation doped polyethylene.