An ${\mathrm{Fe}}^{+}$-type center with axial 〈001〉 symmetry has been studied by electron nuclear double resonance (ENDOR) in the microwave X and Q bands. The ${\mathrm{Fe}}^{+}\mathrm{}\left(\mathrm{I}\right)\mathrm{}$ center is produced only after irradiation with x or γ rays at 80 K of ${\mathrm{SrCl}}_2{:\mathrm{F}\mathrm{e}}^{2+}$ crystals grown in a ${\mathrm{Cl}}_2$ atmosphere. It has a ${3d}^7{}^{4}F{\Gamma }_8$ ground state with spin $S=\frac{3}{2}.$ As shown by the correlated analysis of the ENDOR data and electron paramagnetic resonance superhyperfine structure, the ${\mathrm{Fe}}^{+}$ ion is situated in the center of a tetragonally compressed cube of eight nearest ${\mathrm{Cl}}^{\mathrm{-}}$ ions. The simplest model of the ${\mathrm{Fe}}^{+}\mathrm{}\left(\mathrm{I}\right)\mathrm{}$ center, compatible with the magnetic resonance results, consists of an interstitial ${\mathrm{Fe}}^{+}$ ion with two substitutional monovalent cations, very likely ${\mathrm{K}}^{+}$ ions, in two opposite nearest-neighbor ${\mathrm{Sr}}^{2+}$ sites along the tetragonal axis of the center.

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