  We study the intramolecular vibrational energy redistribution (IVR) dynamics
of an effective spectroscopic Hamiltonian describing the four coupled high
frequency modes of CDBrClF. The IVR dynamics ensuing from nearly isoenergetic
zeroth-order states, an edge (overtone) and an interior (combination) state, is
studied from a state space diffusion perspective. A wavelet based
time-frequency analysis reveals an inhomogeneous phase space due to the
trapping of classical trajectories. Consequently the interior state has a
smaller effective IVR dimension as compared to the edge state.
