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We demonstrate transition between the fine structure splitting of the groundstate of triply ionized zirconium (Zr IV) is suitable for a terahertz (THz)atomic clock. Its transition frequency is about 37.52 THz and is mainly guidedby the magnetic dipole (M1) transition and can be accessible by a readilyavailable laser. We suggest to consider stable even isotopes of Zr and $M_J=\pm 1/2$ sublevels (i.e. $|4D_{3/2},M_J=\pm 1/2\rangle \rightarrow|4D_{5/2},M_J=\pm 1/2\rangle$ clock transition) for the experimental advantage.By performing necessary calculations, we have estimated possible systematicsdue to blackbody radiation, ac Stark, electric quadrupole and second-orderZeeman shifts along with shifts due to the second-order Doppler effects. Theproposed THz atomic clock can be very useful in quantum thermometry andfrequency metrology.

Prospective of Zr$^{3+}$ ion as a THz atomic clock