H-1 ONE-DIMENSIONAL AND 2-DIMENSIONAL 5-PULSE ESEEM INVESTIGATIONS ONA RADIATION CENTER IN BETAINE PHOSPHITE SINGLE-CRYSTALS

1D and 2D five-pulse ESEEM experiments on a PO32- center in gamma-irra diated betaine phosphite are presented to study the protons bound to t he radical in more detail. The ESEEM results are in accordance with pr evious ENDOR investigations. From the 2D five-pulse FSEEM experiments the H-1 ENDOR assignment in the ferroelectric ordered state of betaine phosphile could be completed. Additionally, the occurrence of ordered proton states in the disordered paraelectric high-temperature phase a nd of disordered proton states in the ordered ferroelectric low-temper ature phase as well could be observed due to the enhanced resolution o f the 2D method.