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The time differential perturbed angular correlation (TDPAC) technique has been used to study the nuclear quadrupole interactions of the first excited state of ground state rotational band (2 + , 80 keV, T 1/2  = 1.88 ns) and the band head of the = 4 1  -  band (4 1  - ,1094 keV, T 1/2  = 120 ns) in the  168 Er nucleus of a polycrystalline Er host. At room temperature we obtained the electric quadrupole interaction frequencies ω 0 (K= 0) = 457(15) Mrad/s and ω 0 (K= 4) = 69(2) Mrad/s, respectively, for the 2 +  and 4 -  isomeric states of  168 Er. The ratio of the spectroscopic quadrupole moments, i. e. Q s  (K= 4)/Q s  (K= 0) = 0.69(3), is independent of any model approximation and the electric field gradient at  168 Er in the host metal

Static Electric Quadrupole Moments in the Ground State and K = 4 – 1 Bands in 168 Er