  The fractional quantum Hall effect (FQHE) states at half integer Landau
fillings ($\nu$) have long been of great interest, since they have correlations
that differ from those of the fundamental Laughlin states found at odd
denominators. At $\nu=1/2$ the FQHE has been observed in wide or double quantum
wells, and is ascribed to the two-component Halperin-Laughlin $\Psi_{331}$
state. $\Psi_{331}$ excitations carry charge $\pm e/4$, like the carriers of
$\nu=5/2$ states which are of interest in quantum computation. Further, such an
excitation (quasiparticle or -hole) of $\Psi_{331}$ has unequal, opposite
charge in the top and bottom layers, and hence an up or down dipole moment.
Here we report evidence for a Wigner solid (WS) of such dipolar quasiholes from
a quantitative study of the microwave spectra of a wide quantum well (WQW) at
$\nu$ close to 1/2.
