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Identification of a radiation-induced hole center in KTiOPO4.

Electron-paramagnetic-resonance (EPR) and electron-nuclear double-resonance (ENDOR) techniques have been used to determine the structure of a radiation-induced trapped-hole center in potassium titanyl phosphate (KTiOPO 4 or KTP). A single crystal of KTP was irradiated with 60-kV x rays at 77 K to produce the S=1/2 hole center. Data were then taken near 30 K. Spin-Hamiltonian parameters describing the g matrix and three 31 P hyperfine matrices were obtained from the angular dependence of the EPR and ENDOR spectra, respectively. The principal values of the g matrix are 2.0008, 2.0250, and 2.0422 and the principal values of the largest phosphorus interaction are -6.809, -8.125, and -3.848 MHz