EPR and ENDOR of BaF2:Tm2+under uniaxial stress

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Abstract
Spin-lattice Hamiltonian parameters have been derived from measurements of the effects of uniaxial stress upon the EPR of BaF2:Tm2+. Using these parameters, one may calculate spin-lattice relaxation rates for the direct process which are in excellent agreement with the measurements of Sabisky and Anderson. ENDOR has been used to measure the change of the ligand hyperfine interaction delta (Ap-As)/ delta F for stress applied parallel to the bond axis, giving 12.5(2) kHz kg-1 mm2. This value is nearly twice as large as that predicted by any model which has been previously discussed in the literature of the hyperfine interaction and local distortion of the lattice.