  Low lying excitations of electron liquids in the fractional quantum Hall
(FQH) regime are studied by resonant inelastic light scattering methods. We
present here results from charge and spin excitations of FQH states in the
lowest spin-split Landau levels that are of current interest. In the range of
filling factors $2/5 \geq \nu \geq 1/3$, we find evidence that low energy
quasiparticle excitations can be interpreted with spin-split composite fermion
quasi-Landau levels. At FQH states around $\nu=3/2$, we find well-defined
excitations at 4/3 and 8/5 that are consistent with a spin-unpolarized
population of quasi-Landau levels.
