  Even though composite fermions in the fractional quantum Hall liquid are well
established, it is not yet known up to what energies they remain intact. We
probe the high-energy spectrum of the 1/3 liquid directly by resonant inelastic
light scattering, and report the observation of a large number of new
collective modes. Supported by our theoretical calculations, we associate these
with transitions across two or more composite fermions levels. The formation of
quasiparticle levels up to high energies is direct evidence for the robustness
of topological order in the fractional quantum Hall effect.
