Abstract
EPR and optical absorption spectra of Mn + center in NaCl are studied. EPR spectrum of Mn + at K-band frequency has a hyperfine coupling constant of A=(231±1)×10 −4cm −1 and an isotropic g-value of 1·9992±0·0005. Fine structures caused by second order hyperfine interaction at X-band frequency are analyzed by diagnoalizing the matrix of the spin Hamiltonian which contains the Zeeman and the hyperfine terms. Shf structures are also observed for the magnetic field along <111>. The temperature dependence of the hyperfine coupling constants of Mn 2+, Mn + and Mn o-C is measured and expailed by using theoretical formula based on the phonon-induced hyperfine coupling. It is concluded that the Mn + ion is located at the Na + site. An optical absorption band at 4·47 eV is ascribed to the transitions from the ground state 3 d 54 s( 7 S) to the excited states 3 d 54 p( 7 P) of the Mn + ion. Mn + ion are produced when the Mn o atom traps a positive hole or when the Mn 2+ traps an electron.
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