  The Knight shift of Ga-71 nuclei is measured in two different electron-doped
multiple quantum well samples using optically pumped NMR. These data are the
first direct measurements of the electron spin polarization,
P(nu,T)=<Sz(nu,T)>/max<Sz>, near nu=1/3. The P(T) data at nu=1/3 probe the
neutral spin-flip excitations of a fractional quantum Hall ferromagnet. In
addition, the saturated P(nu) drops on either side of nu=1/3, even in a Btot=12
Tesla field. The observed depolarization is quite small, consistent with an
average of about 0.1 spin-flips per quasihole (or quasiparticle), a value which
does not appear to be explicable by the current theoretical understanding of
the FQHE near nu=1/3.
