Paramagnetic resonance has been observed in an excited ${\Gamma }_5$ triplet state 222°K above the singlet ${\Gamma }_1$ ground state of ${\mathrm{Tm}}^{3+}$ ($4f^{12}$) in TmN (NaCl structure). Much of the observed behavior is understood with exchange small compared with crystal-field effects; however, there is an anomalous minimum in the temperature variation of the resonant $g$.

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