Abstract
Feynman's theorem has been used, in conjunction with the least-square fitting procedure, to develop a method for quick and accurate computation of resonant magnetic field values corresponding to various orientations of the external magnetic field in any chosen plane in an electron paramagnetic resonance experiment. Since here one uses numerically computed eigenvalues and eigenvectors, this method is applicable even to the case when the spin-Hamiltonian matrix contains large off-diagonal elements. In addition, the method is applicable to the case when the spin-Hamiltonian contains hyperfine terms.
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