ENDOR studies at 4.2 K of the radicals in malonic acid single crystals

Proton hyperfine tensors based on ENDOR measurements at 4.2 K are reported for five distinct radical types in X-irradiated crystals of partially deuterated malonic acid. A total of 30 tensors are reported reflecting slightly different orientations of the damage products in the crystal: four tensors for RCHR; four for (RCH 2 ) ∥; ten for (RCH 2 ) ⊥; four for the a radical, (RCH 2 C=0) ∥; six relatively isotropic proton tensors; and two α-like tensors. R=-COOH throughout