Paramagnetic Resonance ofV4+in TiO2

The paramagnetic spectrum of vanadium in Ti${\mathrm{O}}_2$ has been observed at 10.14 and 22.68 kMc/sec. An analysis of the data indicates that the spectrum is due to single $d$ electrons of tetravalent vanadium ions located at titania sites in the lattice. The calculated values of the components of the $g$ tensor and the hyperfine interaction constant are: $g_x=1.915\mathrm{}$, $g_y={1.912}^5$, $g_z={1.956}^5$, $A_x={0.0031}^5$ ${\mathrm{cm}}^{-1\mathrm{}}$, $A_y=0.0043\mathrm{}$ ${\mathrm{cm}}^{-1\mathrm{}}$ and $A_z=0.0142\mathrm{}$ ${\mathrm{cm}}^{-1\mathrm{}}$. The axes of the magnetic coordinate systems of the two nonequivalent ions per unit cell are [$\overline{1}, 1, 0$], [0,0,1], [1,1,0] and [$\overline{1}, \overline{1}, 0$], [0,0,1], [$\overline{1}, 1, 0$].