  We propose a two-dimensional electronic coherence spectroscopy protocol for
determining the time-dependent coherences between the stationary states of a
system induced by a time-dependent system-bath interaction. We also investigate
the role of temporally-correlated noise on coherence dephasing. This protocol
enables dynamical information about the system and its coupling to the
environment to be determined. We show how this protocol can be used to
investigate exciton dynamics in conjugated polymers induced by the coupling of
their torsional modes with the environment.
