  The neutron-deficient mercury isotopes, $^{184,186}$Hg, were studied with the
Recoil Distance Doppler Shift (RDDS) method using the Gammasphere array and the
K\"oln Plunger device. The Differential Decay Curve Method (DDCM) was employed
to determine the lifetimes of the yrast states in $^{184,186}$Hg. An
improvement on previously measured values of yrast states up to $8^{+}$ is
presented as well as first values for the $9_{3}$ state in $^{184}$Hg and
$10^{+}$ state in $^{186}$Hg. $B(E2)$ values are calculated and compared to a
two-state mixing model which utilizes the variable moment of inertia (VMI)
model, allowing for extraction of spin-dependent mixing strengths and
amplitudes.
