Time-differential angular correlation studies of the electric quadrupole interaction of
181
Ta in various Hf compounds are presented. Methods for the analysis of the time spectra are discussed. The experiments yield information on the strength of the quadrupole interaction, and on the axial asymmetry and distribution of the field gradient. Electric field gradients
V
zz
are derived for
181
Ta in Hf metal, HfO
2
, and (NH
4
)
2
HfF
6
.
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