  We analyze electronic excitations (excitations generated by adding or
removing one electron) in the bulk of fractional quantum Hall states in Jain
sequence states, using composite fermion Chern-Simons field theory. Starting
from meanfield approximation in which gauge field fluctuations are neglected,
we use symmetry to constrain the possible composite fermion states contributing
to electronic Green's function and expect discrete infinitely-sharp peaks in
the electronic spectral function. We further consider the electronic
excitations in particle-hole conjugate fractional quantum hall states. Gauge
field fluctuations play an increasingly important role in the electron spectral
function as the filling factor approaches 1/2, and evolve the discrete coherent
peaks into a broad continuum even in the absence of impurities. At that limit,
we switch to the electron perspective and calculate the electron spectral
function via linked cluster approximation from the low to intermediate energy
range. Finally, we compare our results with recent experiments.
