EPR STUDY OF [FEO4 H](0)(ALPHA) CENTER IN AMETHYST/

Electron paramagnetic resonance studies of a hydrogen-compensated Fe3-center in synthetic amethyst have been carried out at 77 K and room t emperature. The population of the center is apparently increased by ir radiation with an similar to 1.5 MeV electron beam. The spin Hamiltoni an parameters of the center at two different temperatures were determi ned for the first time. The absolute values of the 2nd-order parameter s of the zero-field splitting were found to be linear down to 20 K. Th e directions of the largest zero-field splitting of the six equivalent sites were well in accord with the six equivalent-interstitial sites of the charge-compensator H+ in the crystal.