Nuclear Spin-Lattice Relaxation and Dynamic Polarization inγ-Irradiated LiF

High-Field Magic Angle Spinning Dynamic Nuclear Polarization Using Radicals Created by γ-Irradiation

“…Alternatively, several early DNP studies used neutron beam irradiation to induce formation of radicals suitable for DNP. [23][24][25][26] Ionizing radiation, including grays, is known to create stable radicals in a variety of chemical systems. [27][28][29][30][31][32] More recently, Blank and coworkers demonstrated that radicals are created in glucose by exposure to ionizing plasma, 33 and were able to obtain εH ≈ 150 at 3.3 T and 50 K for stationary powders.…”

“…For example, biradical polarizing agents have been added during precipitation and/or crystallization of organic solids from solution or directly incorporated into polymers by swelling them with a radical solution or precipitating them from a radical solution. − Metal centers added as dopants to organic solids , or intrinsic to inorganic materials , have also been used to hyperpolarize nuclei in the bulk. Alternatively, several early DNP studies used neutron beam irradiation to induce formation of radicals that are suitable for DNP. − Ionizing radiation, including γ-rays, is known to create stable radicals in a variety of chemical systems. − More recently, Blank and co-workers demonstrated that radicals are created in glucose by exposure to ionizing plasma and were able to obtain an ε H of ≈150 at 3.3 T and 50 K for stationary powders …”