High-spin states of ${}^{125}\mathrm{I}$ have been populated using the ${}^{122}\mathrm{Sn}({}^7\mathrm{Li},4n){}^{125}\mathrm{I}$ reaction at a beam energy of 44 MeV. Four three-quasiparticle rotational bands originating from neutron alignment were observed. A pair of nearly degenerate positive-parity doublet bands is assigned the $\pi g_{7/2}\otimes \nu h_{11/2}^2$ configuration and proposed as candidate chiral doublet bands. Another positive-parity band and a negative-parity band are assigned the $\pi g_{7/2}\otimes \nu {(g_{7/2}/d_{5/2})}^2$ and $\pi g_{7/2}\otimes \nu h_{11/2}(g_{7/2}/d_{5/2})$ configurations, respectively. These interpretations are supported by the adiabatic and configuration-fixed constrained triaxial relativistic-mean-field and multiparticle plus rotor model calculations.

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• Collective levels
• Electromagnetic transitions
• Energy levels
• High spin states
• Nuclear structure & decays